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Investments (Trust Value) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Fair Values | $ 3,943 | $ 3,948
SCE |  |
Fair Value |  |
Fair Values | 3,943 | 3,948
SCE | Total debt securities and other |  |
Fair Value |  |
Amortized Costs | 2,243 | 2,158
Fair Values | 2,393 | 2,338
SCE | Municipal bonds |  |
Fair Value |  |
Amortized Costs | 632 | 672
Fair Values | 682 | 754
SCE | Government and agency securities |  |
Fair Value |  |
Amortized Costs | 1,146 | 1,025
Fair Values | 1,210 | 1,091
SCE | Corporate bonds |  |
Fair Value |  |
Amortized Costs | 350 | 351
Fair Values | 376 | 377
SCE | Short-term investments and receivables/payables |  |
Fair Value |  |
Amortized Costs | 115 | 110
Fair Values | 125 | 116
SCE | Repurchase agreements |  |
Fair Value |  |
Fair Values |  | $ 41
Repurchase agreement secured by US Treasury Securities (as a percent) |  | 97.00%
SCE | Equity securities |  |
Fair Value |  |
Fair Values | 1,550 | $ 1,610
SCE | Fair Value, Measurements, Recurring |  |
Fair Value |  |
Fair Values | $ 4,033 | $ 4,033

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