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Income Tax - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Income Taxes Disclosure [Line Items] |  |
Income tax expense (benefit) | $ 184 | $ 243
Estimated liability for uncertain tax positions | 12 |
Unrecognized tax benefits, increase resulting from current period tax positions | 1 |
Effective income tax rate reconciliation, uncertainty of taxes | 3 |
Unrecognized tax benefits, net | 11 |
CECONY |  |
Income Taxes Disclosure [Line Items] |  |
Income tax expense (benefit) | 181 |
CECONY | Subsidiaries |  |
Income Taxes Disclosure [Line Items] |  |
Income tax expense (benefit) | 181 | $ 154
Estimated liability for uncertain tax positions | 7 |
Unrecognized tax benefits, increase resulting from current period tax positions | $ 1 |

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