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Non Lease PPAs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Capacity |  |  |  |
Purchased Power Agreements (PPAs) [Abstract] |  |  |  |
Purchased power expense |  | $ 77 | $ 75 | $ 69
Estimated Future Payments Under PPAs [Abstract] |  |  |  |
2024 |  | 80 |  |
2025 |  | 45 |  |
2026 |  | 28 |  |
2027 |  | 9 |  |
2028 |  | 1 |  |
Thereafter |  | 2 |  |
Total |  | 165 |  |
Energy |  |  |  |
Purchased Power Agreements (PPAs) [Abstract] |  |  |  |
Purchased power expense |  | 214 | $ 182 | $ 149
Estimated Future Payments Under PPAs [Abstract] |  |  |  |
2024 | [1] | 207 |  |
2025 | [1] | 94 |  |
2026 | [1] | 47 |  |
2027 | [1] | 10 |  |
2028 | [1] | 10 |  |
Thereafter | [1] | 18 |  |
Total | [1] | $ 386 |  |
[1] | Excludes contingent energy payments for renewable energy PPAs.

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