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Investments (Trust Value) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value |  |
Fair Value | $ 4,527 | $ 4,870
Repurchase agreements |  |
Fair Value |  |
Fair Value | 11 | 37
SCE |  |
Fair Value |  |
Amortized Cost | 2,444 | 2,555
Fair Value | 4,527 | 4,870
SCE | Municipal bonds |  |
Fair Value |  |
Amortized Cost | 872 | 875
SCE | Government and agency securities |  |
Fair Value |  |
Amortized Cost | 1,023 | 1,095
SCE | Corporate bonds |  |
Fair Value |  |
Amortized Cost | 415 | 386
SCE | Short-term investments and receivables/payables |  |
Fair Value |  |
Amortized Cost | 134 | 199
SCE | Fair Value, Measurements, Recurring |  |
Fair Value |  |
Fair Value | 4,549 | 4,889
SCE | Fair Value, Measurements, Recurring | Stocks |  |
Fair Value |  |
Fair Value | 1,879 | 1,972
SCE | Fair Value, Measurements, Recurring | Municipal bonds |  |
Fair Value |  |
Fair Value | 955 | 1,033
SCE | Fair Value, Measurements, Recurring | Government and agency securities |  |
Fair Value |  |
Fair Value | 1,092 | 1,212
SCE | Fair Value, Measurements, Recurring | Corporate bonds |  |
Fair Value |  |
Fair Value | 458 | 446
SCE | Fair Value, Measurements, Recurring | Short-term investments and receivables/payables |  |
Fair Value |  |
Fair Value | $ 143 | $ 207

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