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SAN ONOFRE NUCLEAR GENERATING STATION - NARRATIVE (Details) - San Diego Gas and Electric Company - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Jointly Owned Nuclear Power Plant |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Jointly owned utility plant, proportionate ownership share (as a percent) | 20.00% |
Percent of dismantlement work expense (as a percent) | 20.00% |
ARO related to decommissioning costs | $ 512 |
SONGS 2 and 3 Decommissioning |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Nuclear decommissioning trust authorized withdrawal amount |  | $ 81

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