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Summary of Significant Accounting Policies and Other Matters - Schedule of Investments (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2021 | May 31, 2021 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Supplemental retirement income plan assets | $ 583 | $ 524 |  |  |
Deferred income plan assets | 116 | 99 |  |  |
Other | 3 | 3 |  |  |
Total investments | 1,126 | 999 |  |  |
New York Transco, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Undistributed Earnings, Basic | 16 | 13 |  |  |
CECONY |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Supplemental retirement income plan assets | 560 | 502 |  |  |
Deferred income plan assets | 116 | 99 |  |  |
Other | 8 | 7 |  |  |
Total investments | 684 | 608 |  |  |
New York Transco, LLC | Con Edison Transmission |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment | 254 | 221 |  |  |
New York Transco, LLC | Con Edison Transmission | CECONY |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment | 0 | 0 |  |  |
Mountain Valley Pipeline |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment | 530 | 530 |  |  |
Undistributed Earnings, Basic | 127 | 114 |  |  |
Mountain Valley Pipeline | CET Gas |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment |  |  | $ 166 |  | $ 530
Aggregate project cost | 8,100 |  |  | $ 8,100 |
Mountain Valley Pipeline | Con Edison Transmission |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment | 166 | 144 |  |  |
Mountain Valley Pipeline | 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 | 4 | 8 |  |  |
Virginia Tax Equity Project | CECONY |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment | $ 0 | $ 0 |  |  |

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