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Income Tax - Additional Information (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 01, 2023 | Oct. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit) |  |  | $ 144,000,000 |  | $ 160,000,000 | $ 416,000,000 | $ 330,000,000
Gain (Loss) on sale of the Clean Energy Businesses |  |  | (1,000,000) |  | $ 0 | $ 866,000,000 | $ 0
Gain on sale of subsidiary | $ 866,000,000 |  |  |  |  |  |
Gain on sale of subsidiary, after tax | $ 784,000,000 |  |  |  |  |  |
Increase (decrease) in accumulated deferred tax liabilities |  |  | 228,000,000 |  |  |  |
Increase (decrease) in income taxes payable |  |  | $ (228,000,000) |  |  |  |
State income tax, net of federal income tax benefit (in percent) |  |  | 8.00% |  | 6.00% | 5.00% | 6.00%
Estimated liability for uncertain tax positions |  |  | $ 10,000,000 |  |  | $ 10,000,000 |
Research and development credits |  |  |  |  |  | 2,000,000 |
Reduction of uncertain tax positions |  |  | 12,000,000 |  |  |  |
Effective income tax rate reconciliation, uncertainty of taxes |  |  |  |  |  | 9,000,000 |
Penalties recognized for uncertain tax positions |  |  |  |  |  | 0 | $ 0
Subsequent Event |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Interest paid |  | $ 6,000,000 |  |  |  |  |
Income taxes paid |  | 4,000,000 |  |  |  |  |
Special deposit |  | $ 12,000,000 |  |  |  |  |
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% |
CECONY |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit) |  |  | 109,000,000 |  | $ 124,000,000 | $ 297,000,000 | 232,000,000
Increase (decrease) in accumulated deferred tax liabilities |  |  | 204,000,000 |  |  |  |
Increase (decrease) in income taxes payable |  |  | (204,000,000) |  |  |  |
Reversal of uncertain tax positions |  |  |  |  |  | 4,000,000 |
CECONY | Subsidiaries |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Income tax expense (benefit) |  |  | $ 109,000,000 |  | $ 124,000,000 | $ 297,000,000 | $ 232,000,000
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 |  |  | $ 7,000,000 |  |  | $ 7,000,000 |
Effective income tax rate reconciliation, uncertainty of taxes |  |  |  |  |  | 5,000,000 |
Clean Energy Businesses |  |  |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |
Gain (Loss) on sale of the Clean Energy Businesses |  |  |  |  |  | 214,000,000 |
Renewable energy tax credits |  |  | 13,000,000 |  |  | 13,000,000 |
COVID-19 assistance for uncollectible accounts |  |  | 19,000,000 |  |  | 19,000,000 |
Deferred tax assets, tax credits |  |  | $ 105,000,000 |  |  | 105,000,000 |
Deferred state taxes benefit |  |  |  |  |  | $ 27,000,000 |

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