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Income Tax - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Increase in effective tax rate (in percent) |  | 10.00% |  |  |
Increase to net deferred income tax liabilities | $ 111,000,000 |  |  |  |
Increase in valuation allowance | 10,000,000 |  |  |  |
Deferred income taxes | 121,000,000 | $ 435,000,000 | $ 133,000,000 | $ 85,000,000 |
Write-off of deferred tax assets of other state net operating losses |  | 11,000,000 |  |  |
Deferred income tax benefit from net operating losses |  | $ 3,000,000 |  |  |
State income tax rate (in percent) |  | 6.00% | 4.00% | 4.00% |
Unrecognized tax benefits | 23,000,000 | $ 23,000,000 | $ 17,000,000 | $ 14,000,000 | $ 13,000,000
Effective income tax rate reconciliation, uncertainty of taxes |  | 20,000,000 |  |  |
Unrecognized tax benefits that would have an impact on effective tax rate | 23,000,000 | 23,000,000 |  |  |
Penalties for uncertain tax positions |  | 0 | 0 | 0 |
Excise taxes paid |  | 2,000,000 |  |  |
Uncertain tax positions, released |  | 1,000,000 |  |  |
General Business Tax Credit |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Tax credit carryovers | 767,000,000 | 767,000,000 |  |  |
State | New York State |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards | 892,000,000 | 892,000,000 |  |  |
Deferred tax assets | 84,000,000 | 84,000,000 |  |  |
Expected taxable income minimum |  | $ 5,000,000 |  |  |
State income tax rate (in percent) |  | 7.25% |  |  |
State | New York City |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred tax assets | 17,000,000 | $ 17,000,000 |  |  |
Valuation allowance reversed | 14,000,000 | $ 14,000,000 |  |  |
State | Metropolitan Transportation Authority Subcharge |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
State income tax rate (in percent) |  | 9.40% |  |  |
State | Other States |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred tax assets | 46,000,000 | $ 46,000,000 |  |  |
Valuation allowance reversed | 10,000,000 | 10,000,000 |  |  |
CECONY |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred income taxes |  | $ 85,000,000 | $ 124,000,000 | $ 168,000,000 |
State income tax rate (in percent) |  | 5.00% | 5.00% | 5.00% |
Unrecognized tax benefits | 8,000,000 | $ 8,000,000 | $ 5,000,000 | $ 3,000,000 | $ 2,000,000
Effective income tax rate reconciliation, uncertainty of taxes |  | 6,000,000 |  |  |
Unrecognized tax benefits that would have an impact on effective tax rate | $ 8,000,000 | $ 8,000,000 |  |  |

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