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Other Postretirement Benefits - Additional Information (Details) - Other Postretirement Benefits - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in liability for other postretirement benefits | $ (50,000,000) | $ 62,000,000
Noncurrent liabilities | 72,000,000 | 79,000,000
Increase (decrease) in regulatory liabilities | 2,000,000 |
Other comprehensive income (loss), unrecognized net losses | 2,000,000 |
Other comprehensive (income) loss, prior service cost | 0 |
Expected contributions | 1,000,000 |
CECONY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in liability for other postretirement benefits | (21,000,000) | 35,000,000
Noncurrent liabilities | 27,000,000 | $ 55,000,000
Increase (decrease) in regulatory liabilities | 11,000,000 |
Other comprehensive income (loss), unrecognized net losses | 1,000,000 |
Other comprehensive (income) loss, prior service cost | $ 0 |

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