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Dispositions - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) MWh project | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 01, 2023 USD ($) MWh solarProject | Oct. 01, 2022 USD ($) | Dec. 31, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of solar projects |  | 2 |  |  | 2 |  |
Unbilled contracts receivable |  | $ 4 | $ 4 | $ 80 |  |  | $ 35
Electric Energy |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Notional amount | MWh |  | 33,303,430 |  |  |  |  |
Clean Energy Businesses | Renewables Americas, LLC |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Estimate of possible loss |  | $ 24 |  |  |  |  |
Unbilled contracts receivable |  | 4 |  |  |  |  |
Clean Energy Businesses | Renewables Americas, LLC | Maximum |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Estimate of possible loss |  | 172 |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Clean Energy Businesses |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Consideration the project is sold |  |  |  |  | $ 3,993 | $ 6,800 |
Gain (loss) on disposition of stock in subsidiary |  | 62 | 865 |  |  |  |
Gain (loss) on disposition of stock in subsidiary, after tax |  | 46 | 767 |  |  |  |
Downward price adjustment |  | 33 |  |  |  |  |
Downward price adjustment, after tax |  | 25 |  |  |  |  |
Disposal group, including discontinue operation, transaction costs |  | 0 | 12 | 48 |  |  |
Disposal group, including discontinue operation, transaction costs, after tax |  | 0 | 9 | $ 35 |  |  |
Depreciation and amortization, before tax |  | 41 |  |  |  |  |
Depreciation and amortization, after tax |  | $ 28 |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Clean Energy Businesses | Subsequent Event |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Consideration the project is sold | $ 54 |  |  |  |  |  |
Downward price adjustment | 33 |  |  |  |  |  |
Downward price adjustment, after tax | 25 |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Clean Energy Businesses | Broken Bow II | Subsequent Event |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Consideration the project is sold | $ 54 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Crane Project |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Holding period (in years) |  | 5 years |  |  |  |  |
Carrying value of tax equity interest |  | $ 4 | $ 13 |  |  |  |
Clean Energy Businesses | Electric Energy | Broken Bow II |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Notional amount | MWh |  | 75 |  |  | 75 |  |
CECONY | Electric Energy |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Notional amount | MWh |  | 30,466,200 |  |  |  |  |

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