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Debt and Credit Agreements - Summary of Outstanding Long-term Debt (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Jul. 19, 2024 | Jul. 18, 2024
Debt Instrument [Line Items] |  |  |  |
Amount | $ 900 | $ 3,192 |  |
Amount | (99) | $ (150) |  |
Total long-term debt issued (redeemed) | $ 802 |  |  |
Green Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 5.75% |  |  |
Amount | $ 900 |  |  |
Energy Efficiency Project Financing |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount | $ 1 |  |  |
Minimum | Energy Efficiency Project Financing |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 2.20% |  |  |
Maximum | Energy Efficiency Project Financing |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 4.96% |  |  |
Nonrecourse | CR Nonrecourse Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 2.25% |  | 2.25% | 2.76%
Amount | $ (22) |  |  |
Nonrecourse | Continental Wind Nonrecourse Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 6.00% |  |  |
Amount | $ (28) |  |  |
Nonrecourse | West Medway II Nonrecourse Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 3.225% |  |  |
Amount | $ (25) |  |  |
Nonrecourse | Antelope Valley DOE Nonrecourse Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount | $ (15) |  |  |
Nonrecourse | RPG Nonrecourse Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 4.11% |  |  |
Amount | $ (9) |  |  |
Nonrecourse | Minimum | Antelope Valley DOE Nonrecourse Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 2.29% |  |  |
Nonrecourse | Maximum | Antelope Valley DOE Nonrecourse Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 3.56% |  |  |

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