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Dispositions (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Carrying value of projects sold | $ 44,214.0 |  |  | $ 42,024.0
Stagecoach |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Equity method investment |  | $ 630.0 | $ 667.0 |
Clean Energy Businesses | Subsidiaries |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Carrying value of projects sold |  | $ 192.0 |  |
Gain (loss) on sale of projects | 3.0 |  |  |
Gain on sale, after tax | 2.0 |  |  |
Equity method investment | 11.0 |  |  |
Con Edison Transmission | Subsidiaries | Stagecoach |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale | 1,225.0 |  |  |
CET Gas | Subsidiaries | Stagecoach |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale | $ 629.0 |  |  |

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