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Other Postretirement Benefits - Additional Information (Details) - Other Postretirement Benefits - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in liability for other postretirement benefits | $ (62) | $ 21
Noncurrent liabilities | 79 |
Increase (decrease) in regulatory liabilities | 67 |
Expected contributions | 8 |
CECONY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in liability for other postretirement benefits | (35) | $ 13
Noncurrent liabilities | 55 |
Increase (decrease) in regulatory liabilities | $ 46 |

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