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Dispositions (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2021 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Carrying value of projects sold |  | $ 46,752 |  | $ 44,214 |  |
Stagecoach |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Equity method investment |  |  |  |  | $ 630 | $ 667
Clean Energy Businesses | Subsidiaries |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Carrying value of projects sold |  |  | $ 192 |  |  |
Gain (loss) on sale of projects |  | 3 |  |  |  |
Gain on sale, after tax |  | 2 |  |  |  |
Equity method investment |  | 11 |  |  |  |
Con Edison Transmission | Subsidiaries | Stagecoach |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale | $ 1,225 |  |  |  |  |
Percentage of equity interest acquired (in percent) | 50.00% |  |  | 50.00% |  |
CECONY |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Carrying value of projects sold |  | $ 44,009 |  | $ 41,611 |  |
CECONY | Stagecoach | Purchased Power Costs | Equity Method Investee |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Percentage of equity interest acquired (in percent) |  |  |  | 50.00% |  |

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