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Non Lease PPAs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Capacity |  |  |  |
Purchased Power Agreements (PPAs) [Abstract] |  |  |  |
Purchased power expense |  | $ 81 | $ 77 | $ 75
Estimated Future Payments Under PPAs [Abstract] |  |  |  |
2025 |  | 51 |  |
2026 |  | 34 |  |
2027 |  | 14 |  |
2028 |  | 6 |  |
2029 |  | 6 |  |
Thereafter |  | 2 |  |
Total |  | 113 |  |
Energy |  |  |  |
Purchased Power Agreements (PPAs) [Abstract] |  |  |  |
Purchased power expense |  | 212 | $ 214 | $ 182
Estimated Future Payments Under PPAs [Abstract] |  |  |  |
2025 | [1] | 111 |  |
2026 | [1] | 64 |  |
2027 | [1] | 21 |  |
2028 | [1] | 22 |  |
2029 | [1] | 22 |  |
Thereafter | [1] | 0 |  |
Total | [1] | $ 240 |  |
[1] | Excludes contingent energy payments for renewable energy PPAs.

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