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Variable Interest Entities - Additional Information (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 01, 2023 USD ($) solarProject | Sep. 30, 2023 USD ($) project | Mar. 31, 2023 | Sep. 30, 2023 USD ($) project | Dec. 31, 2022 | Jun. 30, 2021 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of solar projects | 2 | 2 |  | 2 |  |
Clean Energy Businesses |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Equity method investments | $ 20,000,000 | $ 0 |  | $ 0 |  | $ 11,000,000
Income (loss) before tax |  | (4,000,000) |  | (8,000,000) |  |
Income (loss) after tax |  | $ (3,000,000) |  | $ (6,000,000) |  |
Variable Interest Entity, Primary Beneficiary | Con Edison Development | CED Nevada Virginia | Clean Energy Businesses |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Percentage of variable interests (less than) |  |  |  |  | 100.00% |
Variable Interest Entity, Primary Beneficiary | Con Edison Development | Tax Equity Projects | Clean Energy Businesses |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Percentage of variable interests (less than) | 0.00% |  | 100.00% |  |  |

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