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Commitments and Contingencies - Cabin Creek (Details) - USD ($) $ in Millions | Apr. 18, 2025 | Feb. 03, 2025 | Dec. 31, 2023 | Dec. 31, 2015
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Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Cabin Creek estimated costs |  |  |  | $ 88
Cabin Creek actual costs |  |  | $ 110 |
CPUC Staff recommended disallowance |  | $ 21 |  |
UCA recommended disallowance - minimum |  | 71 |  |
UCA recommended disallowance - maximum |  | $ 138 |  |
Return Reduction | $ 8 |  |  |

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