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Income Tax - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 01, 2023 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Income Taxes Disclosure [Line Items] |  |  |  |  |
Income tax expense (benefit) |  | $ 29,000,000 | $ 17,000,000 | $ 272,000,000 | $ 171,000,000
Gain on sale of the Clean Energy Businesses |  | $ 13,000,000 | $ 0 | $ 867,000,000 | $ 0
Gain on sale of subsidiary | $ 867,000,000 |  |  |  |
Gain on sale of subsidiary, after tax | $ 804,000,000 |  |  |  |
State income tax, net of federal income tax benefit (in percent) |  | 2.00% | 7.00% | 4.00% | 6.00%
Estimated liability for uncertain tax positions |  | $ 26,000,000 |  | $ 26,000,000 |
Research and development credits |  |  |  | 3,000,000 |
Effective income tax rate reconciliation, uncertainty of taxes |  |  |  | 23,000,000 |
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate |  | 26,000,000 |  | 26,000,000 |
Penalties recognized for uncertain tax positions |  |  |  | 0 | $ 0
State and Local Jurisdiction | New York State Division of Taxation and Finance |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |
Expected minimum loss |  |  |  | $ 5,000,000 |
State income tax, net of federal income tax benefit (in percent) |  |  |  | 7.25% |
State and Local Jurisdiction | Metropolitan Transportation Authority Subcharge |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |
State income tax, net of federal income tax benefit (in percent) |  |  |  | 9.425% |
Subsidiaries |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |
Income tax expense (benefit) |  | 34,000,000 | $ (10,000,000) | $ 189,000,000 | 108,000,000
CECONY | Subsidiaries |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |
Income tax expense (benefit) |  | $ (34,000,000) | $ (10,000,000) | $ 189,000,000 | $ 108,000,000
State income tax, net of federal income tax benefit (in percent) |  | 5.00% | 5.00% | 5.00% | 5.00%
Increase in accumulated deferred tax liabilities |  | $ 10,000,000 |  |  |
Estimated liability for uncertain tax positions |  | 9,000,000 |  | $ 9,000,000 |
Effective income tax rate reconciliation, uncertainty of taxes |  |  |  | 6,000,000 |
Total amount of unrecognized tax benefits, if recognized, that would reduce effective tax rate |  | 9,000,000 |  | 9,000,000 |
Clean Energy Businesses |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |
Gain on sale of the Clean Energy Businesses |  |  |  | 202,000,000 |
Deferred tax asset, remeasurement of state taxes |  | 10,000,000 |  | 10,000,000 |
Deferred tax benefit, valuation allowance |  | 10,000,000 |  | 10,000,000 |
Deferred tax assets, tax credits |  | $ 107,000,000 |  | 107,000,000 |
Deferred state taxes benefit |  |  |  | $ 44,000,000 |

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