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Summary of Significant Accounting Policies and Other Matters - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | May 31, 2021 | Dec. 31, 2019
--- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Supplemental retirement income plan assets | $ 524 | $ 459 |  |
Deferred income plan assets | 99 | 93 |  |
Other | 3 | 2 |  |
Total investments | $ 999 | 841 |  |
NY Transco | Payment Guarantee by CET Electric of Contributions to New York Transco LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest, percentage | 45.70% |  |  |
NY Transco - Propel NY Energy Project | Payment Guarantee by CET Electric of Contributions to New York Transco LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest, percentage | 41.70% |  |  |
CECONY |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Supplemental retirement income plan assets | $ 502 | 439 |  |
Deferred income plan assets | 99 | 93 |  |
Other | 7 | 7 |  |
Total investments | 608 | 539 |  |
Mountain Valley Pipeline |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment | 530 | 530 |  |
Mountain Valley Pipeline | CET Gas |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment |  |  |  | $ 530
Aggregate project cost |  |  | $ 7,200 |
Mountain Valley Pipeline | Con Edison Transmission |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment | 144 | 111 |  |
Mountain Valley Pipeline | Con Edison Transmission | CECONY |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment | 0 | 0 |  |
New York Transco, LLC | Con Edison Transmission |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment | 221 | 176 |  |
New York Transco, LLC | Con Edison Transmission | CECONY |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment | 0 | 0 |  |
Virginia Tax Equity Project |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment | 8 | 0 |  |
Virginia Tax Equity Project | CECONY |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment | $ 0 | $ 0 |  |

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