Cash paid/(received) during the period for:
Supplemental Cash Flow Information [Abstract]
Customer [Domain]
Customer [Domain]
COVID-19 pandemic deferrals
COVID-19 Pandemic Deferrals [Member]
COVID-19 Pandemic Deferrals
Superfund and other environmental costs
Accrued liabilities
Accrued Environmental Loss Contingencies, Noncurrent
Accrued taxes to affiliated companies
Taxes Payable, Related Parties, Current
Taxes Payable, Related Parties, Current
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Refined Fuels (gallons)
Refined Fuels [Member]
Refined fuels.
Receivable Type [Axis]
Receivable Type [Axis]
Deferred Derivative Losses, Current
Deferred Derivative Losses Current [Member]
Deferred Derivative Losses [Member]
Fair Value, Concentration of Risk, Disclosure Items [Domain]
Fair Value, Concentration of Risk, Disclosure Items [Domain]
All years thereafter
Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net Amounts of Assets/ (Liabilities)
Derivative liabilities
Derivative Liability
Change in Unbilled Contract and Unearned Revenues
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
Pension and other postretirement benefit plan liability adjustments, net of taxes
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent
Other liabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other
Regulatory Agency [Domain]
Regulatory Agency [Domain]
Weighted Average Remaining Lease Term, Operating leases
Operating Lease, Weighted Average Remaining Lease Term
Discrete income tax benefit
Discrete Income Tax Benefit
Discrete Income Tax Benefit
COMPREHENSIVE INCOME
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent
Investment, Name [Axis]
Investment, Name [Axis]
Reconciliation of Beginning and Ending Net Balances for Assets and Liabilities Measured at Level 3 Fair Value
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
NET CHANGE FOR THE PERIOD
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect
Gain (loss) on Level 3 energy derivative assets and liabilities
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings
2022
Finance Lease, Liability, Payments, Due in Next Rolling 12 Months
Settlements
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements
Schedule of Regulatory Assets [Table]
Schedule of Regulatory Assets [Table]
Document Fiscal Year Focus
Document Fiscal Year Focus
2023
Finance Lease, Liability, Payments, Due in Rolling Year Two
West Side of Manhattan
Manhattan [Member]
Manhattan [Member]
Expected deferred revenue
Contract With Customer, Receivable, Expected Amount
Contract With Customer, Receivable, Expected Amount
Lessee, Lease, Description [Line Items]
Lessee, Lease, Description [Line Items]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
2026
Finance Lease, Liability, Payments, Due in Rolling Year Five
Proceeds from issuance of equity
Proceeds from Issuance or Sale of Equity
Weighted Average Discount Rate, Operating leases
Operating Lease, Weighted Average Discount Rate, Percent
Subtractions
Contract with Customer, Liability, Revenue Recognized
0 – 3 years
Guarantee Duration One To Three Years [Member]
Guarantee Duration One To Three Years [Member]
Total deferred gains/(losses)
Deferred Derivative Gains Losses
Deferred Derivative Gains Losses
Business Acquisition [Axis]
Business Acquisition [Axis]
Amount of costs that will not recover from customers
Loss Contingency, Loss in Period
Accrued interest
Increase (Decrease) in Interest Payable, Net
Allowance for uncollectible accounts
Effective Income Tax Rate Reconciliation, Change in Allowance For Uncollectible Accounts, Percent
Effective Income Tax Rate Reconciliation, Change in Allowance For Uncollectible Accounts, Percent
Gas
Oil and Gas, Purchased [Member]
Recognition of net actuarial loss
Recognition of net actuarial loss/(gain)
Defined Benefit Plan, Amortization of Gain (Loss)
Aggregate Fair Value of Companies' Derivative Instruments with Credit-Risk-Related Contingent Features
Disclosure of Credit Derivatives [Table Text Block]
Makeup of net credit exposure with investment-grade counterparties
Maximum Potential Future Exposure On Credit Risk Derivatives With Investment Grade Counterparties
Maximum Potential Future Exposure On Credit Risk Derivatives With Investment Grade Counterparties
Distributions to noncontrolling interest
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Gross Amounts of Recognized Assets/(Liabilities)
Derivative Assets (Liabilities), at Fair Value, Net
Retained Earnings
Retained Earnings [Member]
Capital and retirement costs
Capital And Retirement Costs
Capital And Retirement Costs
Rainey Outages
Rainey Outages [Member]
Rainey Outages
Accounts receivable - customers
Trade Accounts Receivable [Member]
Capital contribution by parent
Proceeds from Contributions from Parent
Protected Portion
Protected Portion [Member]
Protected Portion [Member]
INTEREST EXPENSE
Interest Expense [Abstract]
Ownership interest, percentage
Noncontrolling Interest, Ownership Percentage by Parent
Utility Plant [Domain]
Utility Plant [Domain]
Percentage of variable interests (less than)
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage
Unbilled revenue and net unbilled revenue deferrals
Contract with Customer, Liability, Unbilled Revenue Accruals And Deferrals
Contract with Customer, Liability, Unbilled Revenue Accruals And Deferrals
Capacity (MW)
Electric Capacity Derivative [Member]
Electric Capacity Derivative [Member]
Distributions from equity investments
Proceeds from Equity Method Investment, Distribution
Fair Value, Concentration of Risk [Table]
Fair Value, Concentration of Risk [Table]
Accounts receivable – customers
Increase (Decrease) in Accounts Receivable
Capital expenditures incurred but unpaid as of end of period
Capital Expenditures Incurred but Not yet Paid
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Tax Period [Domain]
Tax Period [Domain]
Net income per common share - basic (dollars per share)
Earnings Per Share, Basic
Cost capitalized
Cost capitalized
Defined Benefit Plan Cost Capitalized
Defined Benefit Plan Cost Capitalized
Negative Revenue Adjustment
Negative Revenue Adjustment [Member]
Negative Revenue Adjustment
Revenue Recognition
Revenue from Contract with Customer [Text Block]
Restricted cash
Restricted Cash and Investments, Current
Regulatory Agency [Axis]
Regulatory Agency [Axis]
Document Type
Document Type
Unamortized debt expense
Unamortized Debt Issuance Expense
Interest on long-term debt
Interest Expense, Debt
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Entity Current Reporting Status
Entity Current Reporting Status
Settlement of prudence proceeding
Prudence Proceeding [Member]
Prudence Proceeding [Member]
Commercial Paper
Commercial Paper [Member]
Borrowings Due 2028
Borrowings Due 2028 [Member]
Borrowings Due 2028
Other non-cash items, net
Other Noncash Income (Expense)
Gross Amounts of Recognized Assets/(Liabilities)
Derivative Asset, Fair Value, Gross Asset
Restricted cash
Restricted Cash and Cash Equivalents
Site Contingency [Line Items]
Site Contingency [Line Items]
Regulatory Liability [Axis]
Regulatory Liability [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Disposal Groups, Including Discontinued Operations [Table]
Disposal Groups, Including Discontinued Operations [Table]
3.77% Senior Notes Due 2046
3.77% Senior Notes Due 2046 [Member]
3.77% Senior Notes Due 2046
Long-term debt
Long-term Debt
Steam
Steam
Steam Plant [Member]
Level 1
Fair Value, Inputs, Level 1 [Member]
Investment loss/impairment
Other than Temporary Impairment Losses, Investments
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Abstract]
Operating Leases
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Add: Incremental shares attributable to effect of potentially dilutive securities (shares)
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Public Utilities, General Disclosures [Line Items]
Public Utilities, General Disclosures [Line Items]
INCOME BEFORE INTEREST AND INCOME TAX EXPENSE
Income Before Interest Income Interest Expense And Income Taxes
Income before interest income, interest expense and income taxes
Scenario [Axis]
Scenario [Axis]
LIABILITIES AND SHAREHOLDERS’ EQUITY
Liabilities and Equity [Abstract]
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate
Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Issuance of common shares - public offering
Proceeds from Issuance Initial Public Offering
Accounts payable
Increase (Decrease) in Accounts Payable
Interest Rate Swap
Interest rate swap
Interest Rate Swap [Member]
Operation and maintenance expenses charged against a storm reserve
Storm Damage Provision
Fair value of derivative liabilities
Derivative Liability, Current
Unprotected excess deferred federal income taxes amortization period
Unprotected Excess Deferred Federal Income Taxes Amortization Period
Unprotected Excess Deferred Federal Income Taxes Amortization Period
Netting Adjustment
Fair Value, Concentration of Credit Risk, Master Netting Arrangements [Member]
Taxes receivable
Income Taxes Receivable, Current
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:
Derivative Assets Liabilities At Fair Value By Balance Sheet Classification [Abstract]
Derivative Assets Liabilities At Fair Value By Balance Sheet Classification [Abstract]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Estimated liability for uncertain tax positions
Unrecognized Tax Benefits
Subsidiaries
Subsidiaries [Member]
STATUTORY TAX RATE
Federal Statutory Income Tax Rate [Abstract]
Federal Statutory Income Tax Rate [Abstract]
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate, net of federal taxes
Unrecognized Tax Benefits that Would Impact Effective Tax Rate, Net of Taxes
Unrecognized Tax Benefits that Would Impact Effective Tax Rate, Net of Taxes
Property damage, clean up and response expense
Property Damage, Clean Up And Response Expense
Property Damage, Clean Up And Response Expense
Net proceeds from sale of equity interest
Noncontrolling Interest, Increase from Sale of Parent Equity Interest
Leases
Lessee, Finance Leases [Text Block]
Number of customers affected with interrupted service
Public Utilities, Number Of Customers Affected
Public Utilities, Number Of Customers Affected
Trading Symbol
Trading Symbol
2.40 percent maturing in 2031
2.40 percent maturing in 2031 [Member]
2.40 percent maturing in 2031
CURRENT LIABILITIES
Liabilities, Current [Abstract]
Receivable [Domain]
Receivable [Domain]
Makeup of net credit exposure non-investment grade/non-rated counterparties
Credit Exposure Nonrated Counter Parties
Credit exposure nonrated counterparties
Accounting Policies [Abstract]
Accounting Policies [Abstract]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Loss on sale of investment (pre-tax)
Equity Method Investment, Realized Gain (Loss) On Disposal, Before Tax
Equity Method Investment, Realized Gain (Loss) On Disposal, Before Tax
Other assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets
Total
Total
Operating Lease, Liability
Weighted Average Discount Rate, Finance leases
Finance Lease, Weighted Average Discount Rate, Percent
Transmission Congestion Contracts/Financial Transmission Rights
Transmission Congestion Contracts Or Financial Transmission Rights [Member]
Transmission Congestion Contracts Or Financial Transmission Rights [Member]
Buyer
Buyer [Member]
Buyer
Leases
Lessee, Operating Leases [Text Block]
Municipal infrastructure support costs
Municipal Infrastructure Support Cost [Member]
Municipal Infrastructure Support Cost [Member]
Beginning balance
Ending balance
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs
Deferred revenue
Contract with Customer, Asset, before Allowance for Credit Loss
Tax Equity Construction Projects
Tax Equity Construction Projects [Member]
Tax Equity Construction Projects
MTA power reliability deferral
MTA Power Reliability Deferral [Member]
MTA Power Reliability Deferral [Member]
Ownership [Axis]
Ownership [Axis]
System benefit charge
System Benefits Charge Liability, Current
System Benefits Charge Liability, Current
Pensions and retiree benefits contributions
Payment for Pension and Other Postretirement Benefits
Preferred stock redemption
Preferred Stock Redemption [Member]
Preferred Stock Redemption [Member]
Income Tax Contingency [Line Items]
Income Tax Contingency [Line Items]
OCI before reclassifications, tax
Other Comprehensive Income (Loss) before Reclassifications, Tax
Included in earnings
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings
Tax Year 2013
Tax Year 2013 [Member]
Revenues from contracts with customers
Revenue from Contract with Customer, Excluding Assessed Tax
Estimated future employer contributions
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year
Electric
Electric Transmission [Member]
Approved rate
Public Utilities, Approved Rate, Amount
Public Utilities, Approved Rate, Amount
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Consolidation Items [Domain]
Consolidation Items [Domain]
CET Gas
CET Gas [Member]
CET Gas
Measurement Input Type [Domain]
Measurement Input Type [Domain]
OTHER INCOME (DEDUCTIONS)
Other Nonoperating Income (Expense) [Abstract]
Net derivative losses/(gains)
Gain (Loss) on Sale of Derivatives
Financial Information by Business Segment
Segment Reporting Disclosure [Text Block]
Weighted Average Remaining Lease Term, Finance leases
Finance Lease, Weighted Average Remaining Lease Term
Regulatory liabilities
Regulatory liabilities – noncurrent
Accrued regulatory liability
Regulatory Liability, Noncurrent
Regulatory Asset [Axis]
Regulatory Asset [Axis]
2025
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Transfer out of level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3
Additional Paid-In Capital
Additional Paid-in Capital [Member]
Total Regulatory Assets
Regulatory assets
Regulatory Assets
Repayments of debt
Repayments of Debt
Common stock dividends per share (dollars per share)
Common Stock, Dividends, Per Share, Cash Paid
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Stagecoach Gas Services LLC
Stagecoach Gas Services LLC [Member]
Stagecoach Gas Services LLC [Member]
2022
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months
Collateral [Domain]
Collateral Held [Domain]
Proceeds from lines of credit
Proceeds from Lines of Credit
Reconciliation to rate level
Effect of Reconciliation to Rate Level
Effect of Reconciliation to Rate Level
Environmental Remediation Site [Domain]
Environmental Remediation Site [Domain]
Long-Term Debt (including current portion)
Long-term Debt, Fair Value
Other current and noncurrent liabilities
Increase (Decrease) in Other Operating Liabilities
TOTAL PERIODIC BENEFIT COST
Periodic Benefit Cost After Amortization Of Regulatory Asset
Total Periodic Benefit Cost After Amortization of Regulatory Asset
Construction work in progress
Public Utilities, Property, Plant and Equipment, Construction Work in Progress
Regulatory Assets [Line Items]
Regulatory Assets [Line Items]
Other investing activities
Payments for (Proceeds from) Other Investing Activities
Additional collateral
Additional Collateral, Aggregate Fair Value
Maximum
Maximum [Member]
Changes in computed taxes resulting from:
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Axis]
Loss Contingency, Nature [Domain]
Loss Contingency, Nature [Domain]
Legal Entity [Axis]
Legal Entity [Axis]
Schedule of Guarantor Obligations [Table]
Schedule of Guarantor Obligations [Table]
Deferred storm costs
Deferred Storm Costs [Member]
Deferred Storm Costs [Member]
Operating Leases, Future Minimum Lease Payments
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Common shareholders’ equity
Beginning Balance
Ending Balance
Stockholders' Equity Attributable to Parent
Allowance for cost of removal less salvage
Asset Retirement Obligation Costs [Member]
Property tax reconciliation
Property Tax Reconciliation [Member]
Regulatory Asset for reconciliation of actual property tax expense to the level allowed in rates.
Other deferred charges and noncurrent assets
Other Assets, Miscellaneous, Noncurrent
Change in fair value relating to Level 3 commodity derivative assets and liabilities
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)
EQUITY
Stockholders' Equity Attributable to Parent [Abstract]
Net proceeds from sale of property
Net Proceeds From Sale Of Property [Member]
Net Proceeds From Sale Of Property [Member]
Deferred charges, noncurrent assets and other regulatory assets
Increase (Decrease) in Deferred Charges
Investment income (loss)
Investment Income, Net
Fair value of derivative liabilities, Current
Derivative Financial Instruments Current Liabilities [Member]
Derivative Financial Instruments Current Liabilities [Member]
Operating lease liabilities
Operating lease liabilities (noncurrent)
Operating Lease, Liability, Noncurrent
Total future minimum lease payments
Finance Lease, Liability, Payment, Due
Face amount of debt
Debt Instrument, Face Amount
TOTAL PERIODIC OTHER POSTRETIREMENT BENEFIT COST
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Operating Segments
Operating segment
Operating Segments [Member]
Schedule of Defined Benefit Plans Disclosures [Table]
Schedule of Defined Benefit Plans Disclosures [Table]
Variable Rate Construction Loan Facility Maturing November 2021
Variable Rate Construction Loan Facility Maturing November 2021 [Member]
Variable Rate Construction Loan Facility Maturing November 2021
Derivatives, Fair Value [Line Items]
Derivatives, Fair Value [Line Items]
Total
Finance Lease, Liability
Capital Stock Expense
Other Changes Stockholders Equity [Member]
Other Changes Stockholders Equity Ending Balance
Equity method investments
Equity Method Investments
Restrictions on Cash and Cash Equivalents
Restrictions on Cash and Cash Equivalents [Table Text Block]
CASH, TEMPORARY CASH INVESTMENTS, AND RESTRICTED CASH:
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Income Statement [Abstract]
Income Statement [Abstract]
Previously Incurred Or Accrued Costs
Previously Incurred Or Accrued Costs [Member]
Previously Incurred Or Accrued Costs
Asset Class [Domain]
Asset Class [Domain]
Short-Term Borrowing
Short-term Debt [Text Block]
INCOME TAX EXPENSE (BENEFIT)
Income tax expense (benefit)
Income Tax Expense (Benefit)
Number of solar electric production projects
Number Of Solar Electric Production Projects
Number Of Solar Electric Production Projects
Accounts receivable – customers, less allowance for uncollectible accounts of $275 and $148 in 2021 and 2020, respectively
Accounts Receivable, after Allowance for Credit Loss, Current
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income (Loss) [Table]
TOTAL CURRENT ASSETS
Assets, Current
Total future minimum lease payments
Lessee, Operating Lease, Liability, to be Paid
2.00% Debentures Due 2021
2.00% Debentures Due 2021 [Member]
2.00% Debentures Due 2021
Schedule of Variable Interest Entities [Table]
Schedule of Variable Interest Entities [Table]
Statement of Financial Position [Abstract]
Statement of Financial Position [Abstract]
System peak reduction and energy efficiency programs
System Peak Reduction And Energy Efficiency Programs [Member]
System Peak Reduction And Energy Efficiency Programs [Member]
Fair Value Measurements
Fair Value Measurement, Policy [Policy Text Block]
Other
Fair Value Other [Member]
Fair Value Other [Member]
Capital expenditures
Public Utilities, Property, Plant and Equipment, Amount of Construction Work in Process Included in Rate Base
Property, Plant and Equipment, Type [Domain]
Long-Lived Tangible Asset [Domain]
O&R
O&R
Orange And Rockland Utilities Inc [Member]
Orange And Rockland Utilities Inc. [Member]
FINANCING ACTIVITIES
Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract]
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Schedule of Cash and Cash Equivalents
Schedule of Cash and Cash Equivalents [Table Text Block]
Fuel oil, gas in storage, materials and supplies, at average cost
Energy Related Inventory Fuel Oil Gas And Materials And Supplies Cost
Energy related inventory, fuel oil, gas and materials and supplies, cost
Entity Small Business
Entity Small Business
All years thereafter
Finance Lease, Liability, Payments, Due in Rolling after Year Five
Renewable electric production projects
Financial And Performance Guarantee For Renewable Electric Production Projects [Member]
Financial and performance guarantee for renewable electric production projects.
Equity Component [Domain]
Equity Component [Domain]
Other receivables, less allowance for uncollectible accounts of $7 in 2021 and 2020
Other Receivables
Issuance of common shares for stock plans
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Variable Interest Entity [Line Items]
Variable Interest Entity [Line Items]
Schedule of Equity Method Investments [Table]
Schedule of Equity Method Investments [Table]
Litigation Case [Axis]
Litigation Case [Axis]
Other income
Other Income
Accounts payable to affiliated companies
Increase (Decrease) in Due to Affiliates, Current
Commercial paper, outstanding
Commercial Paper
Remaining performance obligation
Revenue, Remaining Performance Obligation, Amount
Short-term Debt, Type [Axis]
Short-term Debt, Type [Axis]
Carrying Amounts and Fair Values of Long-Term Debt
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
Fair Value Measurements
Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block]
Recoverable REV demonstration project costs
Recoverable REV Demonstration Project Expenses [Member]
Recoverable REV Demonstration Project Expenses [Member]
Other current liabilities
Finance Lease, Liability, Current
Level 2
Fair Value, Inputs, Level 2 [Member]
Gate station upgrade project
Gate Station Upgrade Project [Member]
Gate Station Upgrade Project [Member]
Revenues, negative adjustment
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Modification of Contract
Catastrophic Event [Axis]
Catastrophic Event [Axis]
Document Information [Table]
Document Information [Table]
Late payment charges and fees, surcharge recovery period
Revenue From Contract With Customer, Late Payment Charges And Fees, Surcharge Recovery Period
Revenue From Contract With Customer, Late Payment Charges And Fees, Surcharge Recovery Period
Earnings sharing - electric, gas and steam
Electric Excess Earnings [Member]
Electric Excess Earnings [Member]
Total pre-tax gains/(losses) recognized in income
Derivative, Gain (Loss) on Derivative, Net
Segment Reporting [Abstract]
Segment Reporting [Abstract]
Pre-tax gains/(losses) recognized in income
Pretax Effects Of Derivative Instruments On Consolidated Statements Of Operations [Abstract]
Pretax Effects Of Derivative Instruments On Consolidated Statements Of Operations [Abstract]
Commodity
Commodity Contract [Member]
Sale of equity interest
Proceeds from Other Equity
Non-utility construction expenditures
Payments Non Utility Construction Expenditures
Payments Non Utility Construction Expenditures
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Finance Leases
Finance Lease, Liability, Payment, Due [Abstract]
Deferred derivative gains
Deferred Derivative Gains, Current
Deferred Derivative Gains Current [Member]
Regulatory Liability for reserve of change in fair value of derivative instrument.
Investment, Name [Domain]
Investment, Name [Domain]
Distribution to noncontrolling interest
Payments to Noncontrolling Interests
Derivatives in net asset position additional collateral
Additional Collateral For Derivative Net Assets
The additional collateral that would be required for derivative instruments that are net assets.
Late payment charges and fees
Revenue From Contracts With Customer, Late Payment Charges And Fees
Revenue From Contracts With Customer, Late Payment Charges And Fees
Software Licenses
Software Licenses [Member]
Software Licenses [Member]
Pension Plan LIabilities
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Retirement Plan Tax Status [Axis]
Retirement Plan Tax Status [Axis]
Product and Service [Domain]
Product and Service [Domain]
Interest rate
Debt Instrument, Interest Rate, Stated Percentage
Income (loss) attributable to non-controlling interest
LOSS (INCOME) ATTRIBUTABLE TO NON-CONTROLLING INTEREST
Net Income (Loss) Attributable to Noncontrolling Interest
Lease Costs, Cash Flows and Other Related Information
Lease, Cost [Table Text Block]
Taxes attributable to non-controlling interests
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent
Geographical [Axis]
Geographical [Axis]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Manhattan Steam Main Rupture
Manhattan Steam Main Rupture [Member]
Manhattan Steam Main Rupture [Member]
Financial Guarantee for Indemnity Agreements for Surety Bonds
Financial Guarantee for Indemnity Agreements for Surety Bonds [Member]
Financial Guarantee for Indemnity Agreements for Surety Bonds [Member]
Total assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets
Other interest expense
Interest Expense [Member]
Beginning balance
Ending balance
Unbilled Contracts Receivable
Net deferred gains/(losses)
Net Deferred Gain Loss
Net deferred gain/(loss)
NET CASH FLOWS FROM FINANCING ACTIVITIES
Net Cash Provided by (Used in) Financing Activities
Income Taxes Disclosure [Line Items]
Income Taxes Disclosure [Line Items]
Income Taxes Disclosure [Line Items]
4.45% 10 Year Debentures
4.45% 10 Year Debentures [Member]
4.45% 10 Year Debentures
Environmental Matters
Environmental Loss Contingency Disclosure [Text Block]
Finance Leases, Future Minimum Lease Payments
Finance Lease, Liability, Fiscal Year Maturity [Table Text Block]
Environmental Exit Cost [Line Items]
Environmental Exit Cost [Line Items]
Cash Collateral Held for Project Finance Agreements
Cash Collateral Held For Project Finance Agreements [Member]
Cash Collateral Held For Project Finance Agreements [Member]
Additions
Unbilled Contracts Receivable, Revenue Recognized
Unbilled Contracts Receivable, Revenue Recognized
Issuance of common shares for dividend reinvestment
Dividends Payable
OPERATING REVENUES
Revenues [Abstract]
Electric Energy (MWh)
Electric Energy Derivative [Member]
Electric Energy Derivative [Member]
Included in regulatory assets and liabilities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Regulatory Assets and Liabilities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Regulatory Assets and Liabilities
Superfund Sites
Superfund Sites [Member]
Superfund Sites [Member]
Consolidated Entities [Domain]
Consolidated Entities [Domain]
State income tax, net of federal income tax benefit
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent
INVESTING ACTIVITIES
Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]
Income Statement Location [Domain]
Income Statement Location [Domain]
Debt instrument term
Debt Instrument, Term
Other
Other Regulatory Liabilities [Member]
Other regulatory liabilities.
NET PLANT
Property, Plant and Equipment, Net
TOTAL OPERATING EXPENSES
Operating Expenses
Catastrophic Event [Domain]
Catastrophic Event [Domain]
Accumulated OCI
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
2024
Finance Lease, Liability, Payments, Due in Rolling Year Three
Additional collateral for non-derivative transactions without extended unsecured credit
Additional Collateral For Non-Derivative Transactions Without Extended Unsecured Credit
Additional Collateral For Non-Derivative Transactions Without Extended Unsecured Credit
Retirement of long-term debt
Repayments of Long-term Debt
Term Loan
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt
Beginning Balance at April 1,
Ending Balance June 30,
Accounts Receivable, Allowance for Credit Loss
Total operating revenues
Total revenues
Revenues
BQDM and REV Demo reconciliations
BQDM And REV Demo Reconciliations [Member]
BQDM And REV Demo Reconciliations [Member]
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)
Loss contingency accrual
Loss Contingency Accrual
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Settlement of gas proceedings
Settlement of Gas Proceedings
Settlement of Gas Proceedings [Member]
Settlement of Gas Proceedings [Member]
Downgrade to Below Investment Grade from Current Ratings
Additional Collateral Aggregate Fair Value Down Below Investment Grade [Member]
Additional Collateral Aggregate Fair Value Down Below Investment Grade [Member]
Con Edison Transmission
Con Edison Transmission [Member]
Con Edison Transmission [Member]
Schedule of Equity Method Investments [Line Items]
Schedule of Equity Method Investments [Line Items]
3.60 percent maturing in 2061
3.60 percent maturing in 2061 [Member]
3.60 percent maturing in 2061
Long-term debt due within one year
Other Long-term Debt, Current
Document Fiscal Period Focus
Document Fiscal Period Focus
Effective tax rate
Effective Income Tax Rate Reconciliation, Percent
Number of people injured in explosion and fire incident (more than)
Number of People Injured in Explosion and Fire Incident
Number of people injured in explosion and fire incident.
Estimate of possible loss (up to)
Loss Contingency, Estimate of Possible Loss
Notional amount
Derivative, Nonmonetary Notional Amount
Cost of removal
Effective Income Tax Rate Reconciliation Cost Of Removal, Percent
Effective Income Tax Rate Reconciliation, cost of removal
Non-utility property, less accumulated depreciation of $555 and $522 in 2021 and 2020, respectively
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Non-Utility Plant, Net, Noncurrent
Tangible assets that are held by an entity for use other than utility production; net of accumulated depreciation.
Regulatory assets
Regulatory assets – noncurrent
Regulatory Assets, Noncurrent
System benefit charge
Increase (Decrease) in System Benefit Charge Liability
Increase (Decrease) in System Benefit Charge Liability
Energy supply and hedging activities credit exposure total
Credit Derivative, Maximum Exposure, Undiscounted
Manufactured gas plant sites
Manufactured Gas Plant Sites
Natural Gas Processing Plant [Member]
Estimated forgone revenues
Revenue From Contract With Customer, Estimated Forgone Revenues
Revenue From Contract With Customer, Estimated Forgone Revenues
Variable Interest Entities
Variable Interest Entity Disclosure [Text Block]
Accrued taxes
Taxes Payable, Current
Leases [Abstract]
Leases [Abstract]
Unrecognized pension and other postretirement costs
Unrecognized Pension And Other Postretirement Costs [Member]
Regulatory Asset for difference between Liability to Fair Value of Plan Assets and Projected Benefit Obligation.
Provision for injuries and damages
Provision For Injuries And Damages
Provision for injuries and damages.
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Program [Domain]
Program [Domain]
[Domain] for Program [Axis]
Other operations and maintenance
Oil and Gas, Operation and Maintenance [Member]
AVERAGE NUMBER OF SHARES OUTSTANDING—DILUTED (shares)
Adjusted weighted average common shares outstanding – diluted (shares)
Weighted Average Number of Shares Outstanding, Diluted
Amount funded from tax equity financing agreement
Proceeds From Tax Equity Financing Agreement
Proceeds From Tax Equity Financing Agreement
Rate case amortization and accruals
Amortization
Restoration costs
Public Utilities, Service And Repair Costs
Public Utilities, Service And Repair Costs
Income Tax
Income Tax Disclosure [Text Block]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Inter-zonal forward price curves adjusted for historical zonal losses
Measurement Input, Commodity Inter-Zonal Forward Price Curve [Member]
Measurement Input, Commodity Inter-Zonal Forward Price Curve [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities [Line Items]
Regulatory Matters
Public Utilities Disclosure [Text Block]
Total Periodic Benefit Costs
Schedule of Net Benefit Costs [Table Text Block]
Gain on sale, after tax
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property, After Tax
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property, After Tax
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Asset retirement obligations
Asset Retirement Obligations, Noncurrent
Guarantor Obligations, Term [Domain]
Guarantor Obligations, Term [Domain]
[Domain] for Guarantor Obligations, Term [Axis]
Credit Facility [Axis]
Credit Facility [Axis]
Other
Other Services [Member]
Other Services [Member]
Non-utility property, accumulated depreciation
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Downgrade One Level from Current Ratings
Additional Collateral Aggregate Fair Value Down One Level [Member]
Additional Collateral Aggregate Fair Value Down One Level [Member]
Other deferred credits and noncurrent liabilities
Deferred Credits and Other Liabilities, Noncurrent
TOTAL CURRENT LIABILITIES
Liabilities, Current
Inter-segment
Intersegment Eliminations [Member]
Non-wire alternative projects
Non Wire Alternative Projects [Member]
Non Wire Alternative Projects [Member]
Public Utilities General Disclosures [Table]
Public Utilities General Disclosures [Table]
Loss Contingencies [Table]
Loss Contingencies [Table]
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Asbestos Suits
Asbestos Suits [Member]
Asbestos Suits [Member]
Nonqualified Plan
Nonqualified Plan [Member]
Copper Mountain - Mesquite Solar
Copper Mountain - Mesquite Solar [Member]
Copper Mountain - Mesquite Solar [Member]
Title of 12(b) Security
Title of 12(b) Security
Regulatory liabilities
Regulatory liabilities – current
Regulatory Liability, Current
Statement [Table]
Statement [Table]
Energy transactions
Financial And Performance Guarantee For Commodity Transactions [Member]
Financial And Performance Guarantee For Commodity Transactions [Member]
Accrued liability
Accrual for Environmental Loss Contingencies
New Financial Accounting Standards
New Accounting Pronouncements, Policy [Policy Text Block]
CEB
Clean Energy Businesses
Clean Energy Businesses [Member]
Clean Energy Businesses [Member]
Requested rate increase (decrease), amount
Public Utilities, Requested Rate Increase (Decrease), Amount
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Alleged number of claims, violations
Loss Contingency, New Claims Filed, Number
Subsequent Event
Subsequent Event [Member]
Cover [Abstract]
Cover [Abstract]
Other noncurrent liabilities
Finance Lease, Liability, Noncurrent
Goodwill
Goodwill
Noncontrolling interest
Stockholders' Equity Attributable to Noncontrolling Interest
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of derivative assets
Offsetting Derivative Assets [Abstract]
Program [Axis]
Program [Axis]
Program [Axis]
Other deductions
Other Nonoperating Expense
Scenario [Domain]
Scenario [Domain]
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Superfund and environmental remediation costs
Other Increase (Decrease) in Environmental Liabilities
Operating lease cost
Operating Lease, Cost
Estimated project cost percentage
Percentage Of Estimated Costs On Projects
Percentage of estimated costs on projects.
Pension Plan Liabilities
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Deferred derivative losses
Derivative Losses Long Term [Member]
Regulatory Asset for deferral of change in fair value of derivative instrument.
Deferred income taxes
Deferred Income Tax Expense (Benefit)
Regulatory assets not earning return
Regulatory Assets Not Earning Return
Regulatory Assets Not Earning Return
Investment Holdings [Line Items]
Investment Holdings [Line Items]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Repurchased Con Edison Stock
Repurchased Con Edison Stock [Member]
Repurchased Con Edison Stock
Fuel
Fuel [Member]
Environmental Remediation Obligations [Abstract]
Environmental Remediation Obligations [Abstract]
Environmental Remediation Contingency [Domain]
Environmental Remediation Contingency [Domain]
Federal
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Earnings Per Common Share
Earnings Per Share, Policy [Policy Text Block]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
NET INCOME
NET INCOME
Net income
Net income for common stock
Net Income (Loss) Attributable to Parent
Entity Emerging Growth Company
Entity Emerging Growth Company
Operating lease right-of-use asset
Operating Lease, Right-of-Use Asset
Loss on sale of investment
Equity Method Investment, Realized Gain (Loss) on Disposal
Interest cost on projected benefit obligation
Interest cost on projected other postretirement benefit obligation
Defined Benefit Plan, Interest Cost
Accrued wages
Employee-related Liabilities, Current
Aggregate fair value – net liabilities
Credit Risk Derivatives, at Fair Value, Net
Income Statement Location [Axis]
Income Statement Location [Axis]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Intangible assets, accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization
Entity Address, Address Line One
Entity Address, Address Line One
Offsetting of Assets
Offsetting Assets [Table Text Block]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Abstract]
Site Contingency [Table]
Site Contingency [Table]
Entity Filer Category
Entity Filer Category
Purchased power
Electricity, Purchased [Member]
Asbestos Proceedings
Asbestos Related [Member]
Asbestos Related [Member]
TOTAL OTHER NONCURRENT ASSETS
Other Assets, Noncurrent
Expected return on plan assets
Defined Benefit Plan, Expected Return (Loss) on Plan Assets
Segments [Axis]
Segments [Axis]
Retirement Benefits [Abstract]
Retirement Benefits [Abstract]
Proceeds from sale
Proceeds from Sale of Equity Method Investments
Issuance of common shares for stock plans
APIC, Share-based Payment Arrangement, Increase for Cost Recognition
Dispositions
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]
Commodity
Fair Value Commodity [Member]
Fair Value Commodity [Member]
Number of buildings destroyed by fire
Number of Buildings Destroyed by Fire
Number of Buildings Destroyed by Fire
NY Transco
NY Transco [Member]
NY Transco [Member]
Liability Class [Axis]
Liability Class [Axis]
Impact in regulatory liability resulting from TCJA
Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Regulatory Liabilities, Income Tax Benefit
Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Regulatory Liabilities, Income Tax Benefit
Impairment charge
Equity Method Investment, Other than Temporary Impairment
Common equity ratio (percent)
Common Equity Ratio, Percentage
Common Equity Ratio, Percentage
Pension and other postretirement benefits deferrals
Pension And Other Post Retirement Benefits Deferrals [Member]
Regulatory Asset for reconciliation of actual pension and other postretirement benefit expenses to the level allowed in rates.
Pensions and retiree benefits
Liability, Defined Benefit Plan, Noncurrent
Summary of Total Guarantees
Schedule of Guarantor Obligations [Table Text Block]
Credit Facility [Domain]
Credit Facility [Domain]
ASSETS
Assets [Abstract]
Recovery period
Regulatory Assets, Recovery Period
Regulatory Assets, Recovery Period
Accounts receivable from affiliated companies
Increase (Decrease) in Due from Affiliates, Current
Natural Gas (Dt)
Natural Gas Derivative [Member]
Natural Gas Derivative [Member]
Derivative Instruments and Hedging Activities
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Entity Address, City or Town
Entity Address, City or Town
Debt Instrument [Axis]
Debt Instrument [Axis]
Income (loss) before tax
Variable Interest Entity, Measure of Activity, Income or Loss before Tax
Makeup of net credit exposure independent system operators
Credit Exposure Independent System Operators
Credit Exposure Independent System Operators
NONCURRENT LIABILITIES
Liabilities, Noncurrent [Abstract]
Other Material Contingencies
Commitments and Contingencies Disclosure [Text Block]
NET UTILITY PLANT
Carrying value of projects sold
Public Utilities, Property, Plant and Equipment, Net
Dividend to parent
Payments of Ordinary Dividends
Recognition of prior service credit
Recognition of prior service credit
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Return on regulatory assets
Return On Regulatory Assets
Return On Regulatory Assets
Right-of-use assets
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Abstract]
CED Nevada Virginia
CED Nevada Virginia [Member]
CED Nevada Virginia
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Entity Interactive Data Current
Entity Interactive Data Current
Banks' commitments under construction loan facility
Line of Credit Facility, Remaining Borrowing Capacity
Number of pending lawsuits
Loss Contingency, Pending Claims, Number
Pension and other postretirement benefit plan liability adjustments, net of taxes
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Public Utility [Axis]
Public Utility [Axis]
April 2021 Credit Agreement, Variable Rate 364 Day Term Loan
April 2021 Credit Agreement, Variable Rate 364 Day Term Loan [Member]
April 2021 Credit Agreement, Variable Rate 364 Day Term Loan
Total deferred gains/(losses)
Deferred Gain Loss Liability
Deferred gain/(loss), liability
Other
Financial And Performance Guarantee Other [Member]
Financial And Performance Guarantee Other [Member]
Capitalization
Capitalization [Text Block]
Capitalization [Text Block]
Deferred costs
Deferred Costs
Property tax refunds
Property Tax Refund [Member]
Property Tax Refund [Member]
Brooklyn Queens demand management program
Brooklyn Queens Demand Management Program [Member]
Brooklyn Queens Demand Management Program [Member]
Prepayments
Prepaid Expense, Current
Disaggregation of Revenue
Disaggregation of Revenue [Table Text Block]
Cost of the program, recovery period
Contract With Customer, Cost Of Program, Recovery Period
Contract With Customer, Cost Of Program, Recovery Period
Deferred Derivative Gains, Noncurrent
Deferred Derivative Gains Non Current [Member]
Deferred Derivative Gains Non Current [Member]
Margin deposits
Margin Deposit Assets
Payment Guarantee by CET Electric of Contributions to New York Transco LLC
Payment Guarantee by CET Electric of Contributions to New York Transco LLC [Member]
Payment Guarantee by CET Electric of Contributions to New York Transco LLC [Member]
Operating lease cash flows
Operating Lease, Payments
Net issuance of short-term debt
Proceeds from (Repayments of) Short-term Debt
Recoveries
Accounts Receivable, Allowance for Credit Loss, Recovery
Return on common equity (percent)
Public Utilities, Requested Return on Equity, Percentage
Regulatory assets
Regulatory assets – current
Regulatory Assets, Current
Schedule of Capitalization [Table]
Schedule of Capitalization [Table]
Reserve adjustments
Accounts Receivable, Credit Loss Expense (Reversal)
Revenue taxes
Revenue Taxes [Member]
Regulatory Asset for timing differences between taxes collected and paid by the Utilities to fund mass transportation.
Fair Value by Liability Class [Domain]
Fair Value by Liability Class [Domain]
Deferred credits and other regulatory liabilities
Increase (Decrease) in Deferred Liabilities
Document Transition Report
Document Transition Report
Net fair value derivative assets/(liabilities)
Offsetting Derivative Assets and Liabilities [Abstract]
Offsetting Derivative Assets and Liabilities [Abstract]
TOTAL LIABILITIES AND EQUITY
Liabilities and Equity
Other
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent
Less: Accumulated depreciation
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation
NJBPU
New Jersey Board of Public Utilities [Member]
New Jersey Board of Public Utilities
Recoverable energy costs
Recoverable Energy Costs, Current
Recoverable Energy Costs [Member]
Recoverable Energy Costs [Member]
Lessee, Lease, Description [Table]
Lessee, Lease, Description [Table]
Total fair value of derivative liabilities
Derivative Financial Instruments, Liabilities [Member]
Estimated aggregate undiscounted potential liability related environmental contaminants (up to)
Potential Undiscounted Liability For Environmental Loss Contingencies Gross
Potential undiscounted liability for environmental loss contingencies gross.
Environmental Remediation Site [Axis]
Environmental Remediation Site [Axis]
Number of regulated utility subsidiaries
Number of Regulated Utility Subsidiaries
Number of Regulated Utility Subsidiaries
TOTAL NONCURRENT LIABILITIES
Liabilities, Noncurrent, Excluding Long-Term Debt
Liabilities, Noncurrent, Excluding Long-Term Debt
NON-UTILITY PLANT
Property, Plant and Equipment, Net [Abstract]
Finance leases, accumulated amortization
Direct Financing Lease, Accumulated Amortization
Direct Financing Lease, Accumulated Amortization
General
Business Description and Basis of Presentation [Text Block]
Basic and Diluted Earnings Per Share
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block]
Income Tax Contingency [Table]
Income Tax Contingency [Table]
Short-term Debt, Type [Domain]
Short-term Debt, Type [Domain]
Tax Equity Investors
Tax Equity Investors [Member]
Tax Equity Investors [Member]
Amounts reclassified from accumulated OCI related to pension plan liabilities, tax
Reclassification from AOCI, Current Period, Tax
OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
OPERATING EXPENSES
Operating Expenses [Abstract]
Ownership percentage
Equity Method Investment, Ownership Percentage
Great Valley Solar
Great Valley Solar [Member]
Great Valley Solar [Member]
Accounting Changes and Error Corrections [Abstract]
Accounting Changes and Error Corrections [Abstract]
Total Regulatory Liabilities
Regulatory Liabilities
Minimum
Minimum [Member]
Deferred income taxes and unamortized investment tax credits
Deferred Tax Liabilities And Accumulated Deferred Investment Tax Credit
Represents the noncurrent portion of deferred tax liabilities and the reserve for accumulated deferred investment tax credits as of the balance sheet date, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference. This is the remaining investment credit, which will reduce the cost of services collected from ratepayers by a ratable portion over the investment's regulatory life.
Unbilled contract revenue
Change in Contract with Customer, Asset [Abstract]
INCOME BEFORE INCOME TAX EXPENSE (BENEFIT)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Sales and use tax refunds
Sales And Use Tax Refunds [Member]
Sales And Use Tax Refunds [Member]
CECONY
Consolidated Edison Company of New York, Inc. [Member]
Consolidated Edison Company of New York, Inc. [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
OTHER NONCURRENT ASSETS
Other Assets, Noncurrent [Abstract]
Other
Other Regulatory Assets [Member]
Other Regulatory Assets [Member]
Issuance of common shares - public offering
Stock Issued During Period, Value, New Issues
2019 Manhattan and Brooklyn Outages
2019 Manhattan and Brooklyn Outages [Member]
2019 Manhattan and Brooklyn Outages
Remediation costs incurred
Environmental Remediation Expense
Line of Credit
Line of Credit [Member]
Senior Notes
Senior Notes [Member]
Unrecognized other postretirement costs
Unrecognized Other Postretirement Benefits Costs [Member]
Unrecognized Other Postretirement Benefits Costs [Member]
Level 3
Fair Value, Inputs, Level 3 [Member]
Common stock dividends
Payments of Ordinary Dividends, Common Stock
Issuance of common shares – public offering (shares)
Stock Issued During Period, Shares, New Issues
Fair value of derivative assets, Current
Derivative Financial Instruments Current Assets [Member]
Derivative Financial Instruments Current Assets [Member]
Other Postretirement Benefits
Postemployment Benefits Disclosure [Text Block]
Allowance for borrowed funds used during construction
Public Utilities, Allowance for Funds Used During Construction, Additions
TCJA net benefits
Tax Cuts And Jobs Act Of 2017, Net Benefits [Member]
Tax Cuts And Jobs Act Of 2017, Net Benefits [Member]
Forward energy prices
Measurement Input, Commodity Forward Energy Price [Member]
Measurement Input, Commodity Forward Energy Price [Member]
Estimated undiscounted asbestos liability (years)
Estimated Undiscounted Asbestos Liability In Year
Estimated Undiscounted Asbestos Liability In Year
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Line Items]
Workers' compensation
Workers’ Compensation
Workers Compensation [Member]
Workers Compensation [Member]
TOTAL OTHER INCOME (DEDUCTIONS)
Nonoperating Income (Expense)
Unprotected Portion
Unprotected Portion [Member]
Unprotected Portion [Member]
Other Postretirement Benefits
Other Postretirement Benefits Plan [Member]
Approved rate increase
Public Utilities, Approved Rate Increase (Decrease), Amount
COMMITMENTS, CONTINGENCIES, AND GUARANTEES (Note B, Note G, and Note H)
Commitments and Contingencies
Allowance for equity funds used during construction
Common equity component of allowance for funds used during construction
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity
Fair value of derivative liabilities, Noncurrent
Derivative Financial Instruments Non Current Liabilities [Member]
Derivative Financial Instruments Non Current Liabilities [Member]
Accounts receivable - customers, allowance for uncollectible accounts
Accounts Receivable, Allowance for Credit Loss, Current
Loans outstanding under the credit agreement
Loans Payable
Investments in electric and gas transmission projects
Payments to Acquire Projects
Greater than 10 years
Guarantee Duration Greater Than Ten Years [Member]
Guarantee duration, greater than 10 years
Debt issuance costs
Payments of Debt Issuance Costs
Net
Net Utility Plant
Tangible assets that are held by an entity for use in the production or supply of utilities and that are expected to provide economic benefit for more than one year; net of accumulated depreciation.
Proceeds from issuance of debt
Proceeds from Issuance of Debt
Retirement Plan Tax Status [Domain]
Retirement Plan Tax Status [Domain]
Document Period End Date
Document Period End Date
Makeup of net credit exposure with commodity exchange brokers
Maximum Potential Future Exposure On Credit Risk Derivatives With Commodity Exchange Brokers
Maximum Potential Future Exposure On Credit Risk Derivatives With Commodity Exchange Brokers
Total credit recognized
Defined Benefit Plan, Cost (Credit) Recognized
Defined Benefit Plan, Cost (Credit) Recognized
OCI before reclassifications, net of tax
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax
Entity Registrant Name
Entity Registrant Name
Less: imputed interest
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Other plant-related items
Effective Income Tax Rate Reconciliation, Other Plant-Related Items, Percent
Effective Income Tax Rate Reconciliation, Other Plant-Related Items, Percent
Electric
Electricity [Member]
COVID-19
COVID-19 [Member]
COVID-19 [Member]
Operating loss carryback
Operating Loss Carryback
Operating Loss Carryback
Short-term Debt [Line Items]
Short-term Debt [Line Items]
Less: imputed interest
Finance Lease, Liability, Undiscounted Excess Amount
Concentration of Credit or Market Risk [Axis]
Concentration of Credit or Market Risk [Axis]
Pension and other postretirement benefit deferrals
Pension and Other Post Retirement Benefits Deferrals, Liabilities [Member]
Pension and Other Post Retirement Benefits Deferrals, Liabilities [Member]
Prepayments
Increase (Decrease) in Prepaid Expense
Carrying Amount
Reported Value Measurement [Member]
Common Stock
Common Stock [Member]
Contracts with customer, revenue recognized, amount outstanding end of last period
Contract With Customer Liability, Revenue Recognized, Previously Outstanding
Contract With Customer Liability, Revenue Recognized, Previously Outstanding
OPERATING INCOME
Operating income/(loss)
Operating Income (Loss)
Fair value of derivative liabilities
Offsetting Derivative Liabilities [Abstract]
Operating lease liabilities
Operating lease liabilities (current)
Operating Lease, Liability, Current
Schedule of Cash and Cash Equivalents [Table]
Schedule of Cash and Cash Equivalents [Table]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cash and temporary cash investments
Cash and Cash Equivalents, at Carrying Value
Current Expected Credit Losses
Allowance for Credit Losses [Text Block]
Treasury Stock
Treasury Stock [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Floating Rate Notes Due 2024
Floating Rate Notes Due 2024 [Member]
Floating Rate Notes Due 2024
Deferred Derivative Losses, Noncurrent
Regulatory Assets Non Current [Member]
Regulatory Assets Non Current [Member]
Notional amount
Derivative, Notional Amount
Credit Loss [Abstract]
Other current liabilities
Other Liabilities, Current
Net Amounts of Assets/ (Liabilities)
Derivative, Fair Value, Net
Unamortized loss on reacquired debt
Unamortized Loss On Reacquired Debt [Member]
Unamortized Loss On Reacquired Debt [Member]
Tax Year 2018 to 2013
Tax Year 2018 Through 2013 [Member]
Tax Year 2018 Through 2013 [Member]
Contributions
Defined Benefit Plan, Plan Assets, Contributions by Employer
Energy services
Energy Service [Member]
Tax credit, amortization period
Tax Cuts And Jobs Act Of 2017, Income Tax Credit, Amortization Period
Tax Cuts And Jobs Act Of 2017, Income Tax Credit, Amortization Period
Utility construction expenditures
Payments for Construction in Process
Gas purchased for resale
Gas Purchased For Resale [Member]
Gas Purchased for Resale [Member]
Schedule of Regulatory Liabilities [Table]
Schedule of Regulatory Liabilities [Table]
Measurement Input Type [Axis]
Measurement Input Type [Axis]
Consolidation Items [Axis]
Consolidation Items [Axis]
Steam
Steam [Member]
Steam [Member]
Net unbilled revenue deferrals
Net Unbilled Revenue Deferrals [Member]
Net Unbilled Revenue Deferrals [Member]
Investment Holdings [Table]
Investment Holdings [Table]
Schedule of Regulatory Assets Not Earning Return
Schedule Of Regulatory Assets Not Earning Return [Table Text Block]
Schedule Of Regulatory Assets Not Earning Return
Schedule of Environmental Exit Cost [Table]
Schedule of Environmental Exit Cost [Table]
Changes in Accumulated Other Comprehensive Income/(Loss)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Notes payable
Notes Payable, Current
Retirement Plan Type [Axis]
Retirement Plan Type [Axis]
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Noncash Investing and Financing Items [Abstract]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Schedule of Short-term Debt [Table]
Schedule of Short-term Debt [Table]
NET INTEREST EXPENSE
Interest Expense
Other
Corporate And Reconciling Items [Member]
Corporate And Reconciling Items [Member]
Weighted average interest rate
Short-term Debt, Weighted Average Interest Rate, at Point in Time
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations and Disposal Groups [Abstract]
Total fair value of derivative assets, Noncurrent
Derivative Financial Instruments Non Current Assets [Member]
Derivative Financial Instruments Non Current Assets [Member]
Meadowlands heater odorization project
Meadowlands Heater Odorization Project [Member]
Meadowlands Heater Odorization Project [Member]
Loss Contingency Nature [Axis]
Loss Contingency Nature [Axis]
City Area Code
City Area Code
Net income (loss)
Variable Interest Entity, Measure Of Activity, Net Income (Loss)
Variable Interest Entity, Measure Of Activity, Net Income (Loss)
Litigation Case [Domain]
Litigation Case [Domain]
Statement of Stockholders' Equity [Abstract]
Statement of Stockholders' Equity [Abstract]
Gross Amounts Offset
Derivative Asset (Liability), Gross Amount Offset in Balance Sheet
Derivative Asset (Liability), Gross Amount Offset in Balance Sheet
Realized and Unrealized Gains or Losses on Commodity Derivatives
Derivative Instruments, Gain (Loss) [Table Text Block]
Amendment Flag
Amendment Flag
Renewables
Renewables [Member]
Renewables [Member]
Floating Debentures
Floating Debentures [Member]
Floating Debentures
Fair Value
Estimate of Fair Value Measurement [Member]
Repayments of lines of credit
Repayments of Lines of Credit
New Financial Accounting Standards
Accounting Standards Update and Change in Accounting Principle [Text Block]
2025
Finance Lease, Liability, Payments, Due in Rolling Year Four
TOTAL EQUITY (See Statement of Equity)
Beginning Balance
Ending Balance
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Amortization of excess deferred federal income taxes
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization Of Excess Deferred Federal Income Taxes, Percent
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization Of Excess Deferred Federal Income Taxes, Percent
Issuance of long-term debt
Proceeds from Issuance of Long-term Debt
Equity Components [Axis]
Equity Components [Axis]
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Abstract]
Residential Customers
Residential Customers [Member]
Residential Customers [Member]
Disaggregation of Revenue [Table]
Disaggregation of Revenue [Table]
Cash Collateral Held For Battery Storage Business
Cash Collateral Held For Battery Storage Business [Member]
Cash Collateral Held For Battery Storage Business
Financial Data for Business Segments
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Brooklyn
Brooklyn [Member]
Brooklyn [Member]
Entity File Number
Entity File Number
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments and Joint Ventures [Abstract]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Manhattan Explosion and Fire
Manhattan Explosion and Fire [Member]
Manhattan Explosion and Fire [Member]
Product and Service [Axis]
Product and Service [Axis]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Construction expenditures in accounts payable
Construction in Progress Expenditures Incurred but Not yet Paid
Guarantor Obligations, Nature [Domain]
Guarantor Obligations, Nature [Domain]
Statement [Line Items]
Statement [Line Items]
Recovery period for deferred derivative losses
Regulatory Assets, Deferred Derivative Losses, Recovery Period
Regulatory Assets, Deferred Derivative Losses, Recovery Period
Gain (loss) on sale of solar electric production project
Gain (loss) on sale of projects
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property
Settlement agreement, amount
Litigation Settlement, Amount Awarded to Other Party
Environmental Remediation Costs
Environmental Remediation Costs Incurred Related To Super Fund Sites [Table Text Block]
Environmental Remediation Costs Incurred Related To Super Fund Sites [Table Text Block]
Retirement Plan Type [Domain]
Retirement Plan Type [Domain]
Pensions and retiree benefits obligations
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits
Accumulated depreciation
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assume, Property, Plant, and Equipment, Property, Plant and Equipment, Non-Utility Plant, Depreciation
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assume, Property, Plant, and Equipment, Property, Plant and Equipment, Non-Utility Plant, Depreciation
Debt Disclosure [Abstract]
Debt Disclosure [Abstract]
Accounts payable to affiliated companies
Due to Affiliate, Current
Entity Address, State or Province
Entity Address, State or Province
Tax Period [Axis]
Tax Period [Axis]
Accounts receivable from affiliated companies
Due from Affiliate, Current
Income tax benefit to be credited to customers resulting from TCJA
Tax Cuts And Jobs Act Of 2017, Income Tax Credit
Tax Cuts And Jobs Act Of 2017, Income Tax Credit
Electric and Gas Transmission Projects
Electric And Gas Transmission Projects [Member]
Electric And Gas Transmission Projects [Member]
Property, Plant and Equipment, Type [Axis]
Long-Lived Tangible Asset [Axis]
Non-utility property, less accumulated depreciation
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assume, Property, Plant, and Equipment, Property, Plant and Equipment, Non-Utility Plant, Net
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assume, Property, Plant, and Equipment, Property, Plant and Equipment, Non-Utility Plant, Net
Entity [Domain]
Entity [Domain]
Other Superfund Sites
Other Superfund Sites [Member]
Other Superfund Sites
Customer [Axis]
Customer [Axis]
Pension Benefits
Retirement Benefits [Text Block]
UTILITY PLANT, AT ORIGINAL COST
Public Utilities, Property, Plant and Equipment [Abstract]
Entity Shell Company
Entity Shell Company
Asset Class [Axis]
Asset Class [Axis]
Local Phone Number
Local Phone Number
Schedule of Regulatory Liabilities
Schedule of Regulatory Liabilities [Table Text Block]
Scenario, Forecast
Forecast [Member]
Income Taxes Disclosure [Table]
Income Taxes Disclosure [Table]
Income Taxes Disclosure [Table]
Injuries and damages reserve
Effective Income Tax Rate Reconciliation, Injuries And Damages Reserve, Percent
Effective Income Tax Rate Reconciliation, Injuries And Damages Reserve, Percent
TOTAL ASSETS
Assets
Issuance of common shares for stock plans
Proceeds from Issuance of Common Stock
Revenue decoupling mechanism
Revenue Decoupling Mechanism [Member]
Revenue Decoupling Mechanism [Member]
Environmental remediation costs
Environmental Restoration Costs [Member]
Interest
Interest Paid, Excluding Capitalized Interest, Operating Activities
Geographical [Domain]
Geographical [Domain]
Capital contribution by parent
Adjustments to Additional Paid in Capital, Contributions by Parent
Adjustments to Additional Paid in Capital, Contributions by Parent
Non- controlling Interest
Noncontrolling Interest [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations [Line Items]
Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings
Accrued Liabilities For Asbestos Suits And Workers Compensation Proceedings [Table Text Block]
Accrued liabilities for asbestos suits and workers compensation proceedings.
Depreciation and amortization
Depreciation, Depletion and Amortization, Nonproduction
Derivative Contract [Domain]
Derivative Contract [Domain]
Cost of removal less salvage
Payments for (Proceeds from) Removal Costs
Tropical Storm
Tropical Storm [Member]
Tropical Storm [Member]
Customer deposits
Contract with Customer, Refund Liability, Current
Summary of Significant Accounting Policies and Other Matters
Significant Accounting Policies [Text Block]
Expected timing of satisfaction
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Outstanding borrowings
Short-term Debt
NET CASH FLOWS FROM OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value, Recurring and Nonrecurring [Table]
Fair Value, Recurring and Nonrecurring [Table]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Entity Tax Identification Number
Entity Tax Identification Number
2024
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three
Cash and Cash Equivalents [Line Items]
Cash and Cash Equivalents [Line Items]
Subtractions
Unbilled Contracts Receivable, Decrease From Billings
Unbilled Contracts Receivable, Decrease From Billings
AVERAGE NUMBER OF SHARES OUTSTANDING-BASIC (shares)
Weighted average common shares outstanding – basic (shares)
Weighted Average Number of Shares Outstanding, Basic
Net income per common share - diluted (dollars per share)
Earnings Per Share, Diluted
Other interest
Interest Expense (Income), Other, Net
Interest Expense (Income), Other, Net
Segments [Domain]
Segments [Domain]
Number of registrants
Number of Registrants
Number of Registrants
Service cost – including administrative expenses
Service cost - including administrative expenses
Defined Benefit Plan, Service Cost
Income taxes
Income Taxes Paid, Net
Late fee and other fees not collected
Late Fee Income and Other Fees Not Collected
Late Fee Income and Other Fees Not Collected
Intangible assets, less accumulated amortization of $249 and $228 in 2021 and 2020, respectively
Intangible Assets, Net (Excluding Goodwill)
COMPREHENSIVE INCOME
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Beginning balance
Ending balance
Contract with Customer, Liability
Guarantor Obligations, Term [Axis]
Guarantor Obligations, Term [Axis]
Guarantor Obligations, Term [Axis]
Regulatory Liability [Domain]
Regulatory Liability [Domain]
OTHER COMPREHENSIVE INCOME, NET OF TAXES
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Additions
Contract with Customer, Liability, Decrease From Billings
Contract with Customer, Liability, Decrease From Billings
CARES Act NOL carryback
Effective Income Tax Rate Reconciliation, CARES Act NOL Carryback, Percent
Effective Income Tax Rate Reconciliation, CARES Act NOL Carryback, Percent
Fair value of derivative liabilities
Derivative Liability, Noncurrent
Collateral posted
Collateral Already Posted, Aggregate Fair Value
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Electricity
Electricity Swaps [Member]
Electricity Swaps [Member]
Schedule of Income Tax Reconciliation
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Number of people died in explosion and fire incident
Number of People Died in Explosion and Fire Incident
Number of people died in explosion and fire incident.
Ongoing Operations And Maintenance Costs
Ongoing Operations And Maintenance Costs [Member]
Ongoing Operations And Maintenance Costs
Forward capacity prices
Measurement Input, Commodity Forward Capacity Price [Member]
Measurement Input, Commodity Forward Capacity Price [Member]
Gas
Gas
Gas Transmission [Member]
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity, Primary Beneficiary [Member]
Accounts payable
Accounts Payable, Current
Refundable energy costs
Refundable Energy Cost Current [Member]
Refundable Energy Cost - Current [Member]
Schedule of Capitalization [Line Items]
Schedule of Capitalization [Line Items]
Other operations and maintenance expense
Other Operations And Maintenance Expense [Member]
Other Operations And Maintenance Expense [Member]
4 – 10 years
Guarantee Duration Four To Ten Years [Member]
Guarantee Duration Four To Ten Years [Member]
Collateral [Axis]
Collateral Held [Axis]
Assets and Liabilities Measured at Fair Value on Recurring Basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Common stock dividends
Dividends, Common Stock
Summary of VIEs
Schedule of Variable Interest Entities [Table Text Block]
Accumulated Other Comprehensive Income/(Loss)
Accumulated OCI
AOCI Attributable to Parent [Member]
Materials and supplies, including fuel oil and gas in storage
Increase (Decrease) in Inventories
Accrued unbilled revenue
Contract with Customer, Asset, after Allowance for Credit Loss
Beginning Balance (shares)
Ending Balance (shares)
Common Stock, Shares, Outstanding
INVESTMENTS
Long-term Investments
Regulatory Asset [Domain]
Regulatory Asset [Domain]
Operating costs
Cost of Goods and Services Sold
Net tax refund
Income Taxes Receivable
Divestiture of renewable electric projects, net
Proceeds from Divestiture of Businesses
Unearned revenue
Change in Contract with Customer, Liability [Abstract]
Other
Product and Service, Other [Member]
Revenue decoupling mechanism receivable
Increase (Decrease) In Revenue Decoupling Mechanism Receivables
Increase (Decrease) In Revenue Decoupling Mechanism Receivables
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Foregone Customer Recovery
Foregone Customer Recovery [Member]
Foregone Customer Recovery
2026
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five
Assets under finance leases
Direct Financing Lease, Residual Value of Leased Asset
Loss Contingencies [Line Items]
Loss Contingencies [Line Items]
NYSPSC
NYSPSC [Member]
NYSPSC [Member]
Gross Amounts Offset
Derivative Asset, Fair Value, Gross Liability
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Net Amounts of Assets/ (Liabilities)
Derivative assets
Fair Value of commodity derivatives
Derivative Asset
Tax Equity Projects
Tax Equity Projects [Member]
Tax Equity Projects [Member]
Document Quarterly Report
Document Quarterly Report
Equipment
Equipment [Member]
Gross Amounts Offset
Derivative Liability, Fair Value, Gross Asset
Operation and maintenance expenses
Utilities Operating Expense, Maintenance and Operations
General
Public Utilities, Property, Plant and Equipment, Common
Unobservable Inputs Range (dollar per unit)
Derivative Asset, Measurement Input
Total fair value of derivative assets
Derivative Financial Instruments, Assets [Member]
Accrued Liabilities and Regulatory Assets
Accrued Liabilities And Regulatory Assets [Table Text Block]
Accrued Liabilities And Regulatory Assets [Table Text Block]
LONG-TERM DEBT
Long-term Debt, Excluding Current Maturities
Energy efficiency portfolio standard unencumbered funds
Energy Efficiency Portfolio Standard Unencumbered Funds [Member]
Energy Efficiency Portfolio Standard Unencumbered Funds [Member]
Tax Equity Financing Agreement
Tax Equity Financing Agreement [Member]
Tax Equity Financing Agreement
Schedule of Regulatory Assets
Schedule of Regulatory Assets [Table Text Block]
Non-utility revenue
Non Utility Revenue [Member]
Non-utility Revenue [Member]
Revenue decoupling mechanism receivable
Revenue Decoupling Mechanism Receivable
Revenue Decoupling Mechanism Receivable
Con Edison Development
Consolidated Edison Development [Member]
Consolidated Edison Development [Member]
System benefit charge carrying charge
System Benefit Charge Carrying Charge [Member]
System Benefit Charge Carrying Charge [Member]
NET INCOME
NET INCOME
Net income
Net income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Total liabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities
BALANCE AT BEGINNING OF PERIOD
BALANCE AT END OF PERIOD
Total cash, temporary cash investments and restricted cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Hedged Volume of Derivative Transactions
Schedule of Derivative Instruments [Table Text Block]
Total guarantees, by type and term
Guarantee obligations maximum exposure
Guarantor Obligations, Maximum Exposure, Undiscounted
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
2023
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two
Environmental Remediation Contingency [Axis]
Environmental Remediation Contingency [Axis]
CURRENT ASSETS
Assets, Current [Abstract]
Statement of Comprehensive Income [Abstract]
Statement of Comprehensive Income [Abstract]
Entity Central Index Key
Entity Central Index Key
Security Exchange Name
Security Exchange Name
Other receivables
Other Receivables [Member]
Other Receivables [Member]
Deferred derivative losses
Derivative Losses Current [Member]
Regulatory Asset for deferral of change in fair value of derivative instrument.
Insurance receivable
Insurance Settlements Receivable
TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAXES
Other comprehensive income
Other Comprehensive Income (Loss), Net of Tax
Accrued interest
Interest Payable, Current
Other receivables, allowance for uncollectible accounts
Allowance for Credit Loss, Receivable, Other, Current
Current Fiscal Year End Date
Current Fiscal Year End Date
Write off
Write-offs
Accounts Receivable, Allowance for Credit Loss, Writeoff
Measurement Basis [Axis]
Measurement Basis [Axis]
Utility plant, at original cost
Public Utilities, Property, Plant and Equipment, Transmission and Distribution
NET CASH FLOWS USED IN INVESTING ACTIVITIES
Net Cash Provided by (Used in) Investing Activities
Portion at Fair Value Measurement
Portion at Fair Value Measurement [Member]
CHANGES IN ASSETS AND LIABILITIES
Increase (Decrease) in Operating Capital [Abstract]
Taxes receivable
Increase (Decrease) in Income Taxes Receivable
TCJA, net benefit amortization, allocation period
Tax Cuts And Jobs Act Of 2017, Net Benefit Amortization, Allocation Period
Tax Cuts And Jobs Act Of 2017, Net Benefit Amortization, Allocation Period
Food and medicine spoilage expense
Utilities Operating Expense, Food And Medicine Spoilage Expense
Utilities Operating Expense, Food And Medicine Spoilage Expense
Maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Ownership [Domain]
Ownership [Domain]
Non-utility
Non-Utility Products And Services [Member]
Non-Utility Products And Services [Member]
Other Customer-Provided Capital rate
Other Customer Provided Capital Rate
Other Customer Provided Capital Rate
Taxes, other than income taxes
Taxes, Miscellaneous
Document Information [Line Items]
Document Information [Line Items]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Litigation settlement, period
Litigation Settlement, Period
Litigation Settlement, Period
Other current assets
Other Assets, Current
Offsetting of Liabilities
Offsetting Liabilities [Table Text Block]
Future income tax
Deferred Income Tax Charge [Member]
Gross Amounts of Recognized Assets/(Liabilities)
Derivative Liability, Fair Value, Gross Liability
Other receivables and other current assets
Increase (Decrease) in Other Receivables
Schedule of Commodity Derivatives
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Renewable energy credits
Effective Income Tax Rate Reconciliation, Tax Credit, Renewable Energy Credits, Percent
Effective Income Tax Rate Reconciliation, Tax Credit, Renewable Energy Credits, Percent
Construction work in progress
Construction in Progress, Gross
Accrued taxes
Increase (Decrease) in Property and Other Taxes Payable
Pension Benefits
Pension Plan [Member]
Regulated Operations [Abstract]
Regulated Operations [Abstract]
Unamortized debt discount
Debt Instrument, Unamortized Discount
Rollforward of Allowance for Credit Losses
Accounts Receivable, Allowance for Credit Loss [Table Text Block]
Effective income tax rate reconciliation, uncertainty of taxes
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount
Term loan
Loans Payable to Bank, Current
TOTAL
Public Utilities, Property, Plant and Equipment, Plant in Service
RECO
Rockland Electric Company [Member]
Rockland Electric Company
Costs To Reimburse Customers For Food And Medicine Spoilage
Costs To Reimburse Customers For Food And Medicine Spoilage [Member]
Costs To Reimburse Customers For Food And Medicine Spoilage
Summer Cooling Credit Program
Summer Cooling Credit Program [Member]
Summer Cooling Credit Program [Member]