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Dispositions - Narrative (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2023 USD ($) project solarProject | Jun. 30, 2023 USD ($) MWh project | Jun. 30, 2023 USD ($) MWh project | Dec. 31, 2022 USD ($) | Oct. 01, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gain on sale of subsidiary | $ 867 |  |  |  |  |  |
Gain on sale of subsidiary, after tax | $ 804 |  |  |  |  |  |
Period to obtain consent (in years) |  | 2 years | 2 years |  |  |  |
Number of solar projects | 2 | 2 | 2 |  |  |  |
Unbilled Contracts Receivable |  | $ 15 | $ 15 | $ 80 |  | $ 21 | $ 35
Clean Energy Businesses | RWE |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Estimate of possible loss (up to) |  | 12 | 12 |  |  |  |
Unbilled Contracts Receivable |  | 15 | 15 |  |  |  |
Clean Energy Businesses | RWE | Maximum |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Estimate of possible loss (up to) |  | 172 | 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 from sale of business | $ 3,993 |  |  |  | $ 6,800 |  |
Gain on sale of subsidiary |  | $ 13 | 867 |  |  |  |
Gain on sale of subsidiary, after tax |  |  | $ 804 |  |  |  |
Tax equity projects | project | 2 | 3 | 3 |  |  |  |
Transaction costs, before tax |  | $ 11 | $ 12 | 48 |  |  |
Transaction costs, after tax |  | 8 | 8 | $ 35 |  |  |
Depreciation and amortization, before tax |  |  | 41 |  |  |  |
Depreciation and amortization, after tax |  |  | $ 28 |  |  |  |
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 |  | $ 15 | $ 15 |  |  |  |
Electric Energy (MWh) |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Notional amount | MWh |  | 27,335,565 | 27,335,565 |  |  |  |
Broken Bow II | Electric Energy (MWh) | Clean Energy Businesses |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Deferred projects | project | 1 | 1 | 1 |  |  |  |
Notional amount | MWh |  | 75 | 75 |  |  |  |

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