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Plant and Depreciation Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Summary of Significant Accounting Policies and Other Matters - Capitalized Cost of Utility Plant (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Summary of Significant Accounting Policies and Other Matters - Other Deferred Charges (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Summary of Significant Accounting Policies and Other Matters - Long-Lived and Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Summary of Significant Accounting Policies and Other Matters - Recoverable Energy Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Summary of Significant Accounting Policies and Other Matters - Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Summary of Significant Accounting Policies and Other Matters - Schedule of Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Summary of Significant Accounting Policies and Other Matters - Pension and Other Postretirement Benefits (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Summary of Significant Accounting Policies and Other Matters - Earnings Per Common Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Summary of Significant Accounting Policies and Other Matters - Reconciliation of Cash, Temporary Investments and Restricted Cash (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Summary of Significant Accounting Policies and Other Matters - Assets Held For Sale (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Regulatory Matters - Current Rate Case Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Regulatory Matters - Schedule of Utilities Rate Plans (CECONY-Electric) (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Regulatory Matters - Schedule of Utilities Rate Plans (CECONY-Gas) (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Regulatory Matters - Schedule of Utilities Rate Plans (CECONY-Steam) (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Regulatory Matters - Schedule of Utilities Rate Plans (O&R New York-Electric) (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Regulatory Matters - Schedule of Utilities Rate Plans (O&R New York-Gas) (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Regulatory Matters - Schedule of Utilities Rate Plans (RECO) (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Regulatory Matters - RECO Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Regulatory Matters - Other Regulatory Matters (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Regulatory Matters - Schedule of Regulatory Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - Regulatory Matters - Regulatory Assets and Liabilities Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - Regulatory Matters - Schedule of Regulatory Assets Not Earning a Return (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - Capitalization - Common Stock (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - Capitalization - Dividends (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - Capitalization - Schedule of Long-Term Debt Maturities (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - Capitalization - Long-term Debt, Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - Capitalization - Schedule of Carrying Amounts and Fair Values of Long-Term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - Capitalization - Significant Debt Covenants (Details) link:presentationLink link:calculationLink link:definitionLink 9955562 - Disclosure - Short-Term Borrowing (Details) link:presentationLink link:calculationLink link:definitionLink 9955563 - Disclosure - Pension Benefits - Schedule of Total Periodic Benefit Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955564 - Disclosure - Pension Benefits - Schedule of Funded Status (Details) link:presentationLink link:calculationLink link:definitionLink 9955565 - 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Schedule of Fair Values of Plan Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955579 - Disclosure - Environmental Matters - Schedule of Accrued Liabilities and Regulatory Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955580 - Disclosure - Environmental Matters - Schedule of Environmental Remediation Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955581 - Disclosure - Environmental Matters - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955582 - Disclosure - Environmental Matters - Schedule of Accrued Liability for Asbestos Suits and Workers' Compensation Proceedings (Details) link:presentationLink link:calculationLink link:definitionLink 9955583 - Disclosure - Material Contingencies - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955584 - Disclosure - Material Contingencies - Schedule of Total Guarantees (Details) link:presentationLink link:calculationLink link:definitionLink 9955585 - Disclosure - Electricity and Gas Purchase Agreements - Schedule of Estimated Capacity and Other Fixed Payments (Details) link:presentationLink link:calculationLink link:definitionLink 9955586 - Disclosure - Electricity and Gas Purchase Agreements - Schedule of Capacity, Energy and Other Fixed Payments (Details) link:presentationLink link:calculationLink link:definitionLink 9955587 - Disclosure - Leases - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955588 - Disclosure - Leases - Schedule of Operating Lease Cost Cand Cash Paid for Amounts (Details) link:presentationLink link:calculationLink link:definitionLink 9955589 - Disclosure - Leases - Schedule of Operating Lease Cost and Cash Paid for Amounts (Details) link:presentationLink link:calculationLink link:definitionLink 9955590 - Disclosure - Leases - Schedule of Future Minimum Lease Payments (Details) link:presentationLink link:calculationLink link:definitionLink 9955590 - Disclosure - 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Disclosure - Revenue Recognition - Schedule of Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955599 - Disclosure - Revenue Recognition - Schedule of Change in Unbilled Contract and Unearned Revenues (Details) link:presentationLink link:calculationLink link:definitionLink 9955600 - Disclosure - Current Expected Credit Losses - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955601 - Disclosure - Current Expected Credit Losses - Schedule of Roll forward of Allowance for Credit Losses (Details) link:presentationLink link:calculationLink link:definitionLink 9955602 - Disclosure - Stock-Based Compensation - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955603 - Disclosure - Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955604 - Disclosure - Stock-Based Compensation - Schedule of Assumptions Used to Calculate Fair Value of Awards (Details) link:presentationLink link:calculationLink link:definitionLink 9955605 - Disclosure - Stock-Based Compensation - Schedule of Changes in Status of Performance RSUs (Details) link:presentationLink link:calculationLink link:definitionLink 9955606 - Disclosure - Stock-Based Compensation - Schedule of Changes in Status of Time-Based Awards (Details) link:presentationLink link:calculationLink link:definitionLink 9955607 - Disclosure - Financial Information by Business Segment (Details) link:presentationLink link:calculationLink link:definitionLink 9955608 - Disclosure - Financial Information by Business Segment- Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955609 - Disclosure - Derivative Instruments and Hedging Activities - Schedule of Fair Values of Commodity Derivatives Including Offsetting of Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955610 - Disclosure - Derivative Instruments and Hedging Activities - Schedule of Realized and Unrealized Gains or Losses on Commodity Derivatives (Details) link:presentationLink link:calculationLink link:definitionLink 9955611 - Disclosure - Derivative Instruments and Hedging Activities - Schedule of Hedged Volume of Derivative Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 9955612 - Disclosure - Derivative Instruments and Hedging Activities - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955613 - Disclosure - Derivative Instruments and Hedging Activities - Schedule of Aggregate Fair Value of Companies' Derivative Instruments with Credit-Risk-Related Contingent Features (Details) link:presentationLink link:calculationLink link:definitionLink 9955614 - Disclosure - Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955615 - 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