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Variable Interest Entities - HLVB Method of Accounting (Details) - Variable Interest Entity, Primary Beneficiary - Clean Energy Businesses - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
CED Nevada Virginia | Tax equity investor |  |
Schedule of Equity Method Investments [Line Items] |  |
Income (loss) | $ (49) | $ (158)
Net income (loss) | (37) | (119)
CED Nevada Virginia | Con Edison |  |
Schedule of Equity Method Investments [Line Items] |  |
Income (loss) | 41 | 155
Net income (loss) | 31 | 117
Tax Equity Projects | Tax equity investor |  |
Schedule of Equity Method Investments [Line Items] |  |
Income (loss) | (11) | 6
Net income (loss) | (8) | 4
Tax Equity Projects | Con Edison |  |
Schedule of Equity Method Investments [Line Items] |  |
Income (loss) | 51 | 30
Net income (loss) | $ 38 | $ 24

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