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Summary of Significant Accounting Policies and Other Matters - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | May 31, 2021 | Dec. 31, 2019
--- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Supplemental retirement income plan assets | $ 459 | $ 525 |  |
Deferred income plan assets | 93 | 102 |  |
Other | 2 | 3 |  |
INVESTMENTS | $ 841 | 853 |  |
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% |  |  |
CECONY |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Supplemental retirement income plan assets | $ 439 | 499 |  |
Deferred income plan assets | 93 | 102 |  |
Other | 7 | 7 |  |
INVESTMENTS | 539 | 608 |  |
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 |  |  | $ 6,600 |
Mountain Valley Pipeline | Con Edison Transmission |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment | 111 | 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 | 176 | 112 |  |
New York Transco, LLC | Con Edison Transmission | CECONY |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment | $ 0 | $ 0 |  |

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