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Investments (Trust Value) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value |  |
Fair Value | $ 3,948 | $ 4,870
SCE |  |
Fair Value |  |
Fair Value | 3,948 | 4,870
SCE | Total debt securities and other |  |
Fair Value |  |
Amortized Cost | 2,158 | 2,555
Fair Value | 2,338 | 2,898
SCE | Government and agency securities |  |
Fair Value |  |
Amortized Cost | 1,025 | 1,095
Fair Value | 1,091 | 1,212
SCE | Corporate bonds |  |
Fair Value |  |
Amortized Cost | 351 | 386
Fair Value | 377 | 446
SCE | Municipal bonds |  |
Fair Value |  |
Amortized Cost | 672 | 875
Fair Value | 754 | 1,033
SCE | Short-term investments and receivables/payables |  |
Fair Value |  |
Amortized Cost | 110 | 199
Fair Value | 116 | 207
SCE | Repurchase agreements |  |
Fair Value |  |
Fair Value | $ 41 | $ 37
Repurchase agreement secured by US Treasury Securities (as a percent) | 97.00% | 100.00%
SCE | Equity securities |  |
Fair Value |  |
Fair Value | $ 1,610 | $ 1,972
SCE | Fair Value, Measurements, Recurring |  |
Fair Value |  |
Fair Value | $ 4,033 | $ 4,889

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