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Investments (Trust Value) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value |  |
Fair Value | $ 4,870 | $ 4,833
Repurchase agreements |  |
Fair Value |  |
Fair Value | 37 | 138
SCE |  |
Fair Value |  |
Amortized Cost | 2,555 | 2,494
Fair Value | 4,870 | 4,833
SCE | Stocks |  |
Fair Value |  |
Fair Value | 1,972 | 1,908
SCE | Municipal bonds |  |
Fair Value |  |
Amortized Cost | 875 | 1,013
SCE | U.S. government and agency securities |  |
Fair Value |  |
Amortized Cost | 1,095 | 740
SCE | Corporate bonds |  |
Fair Value |  |
Amortized Cost | 386 | 460
Fair Value | 446 |
SCE | Short-term investments and receivables/payables |  |
Fair Value |  |
Amortized Cost | 199 | 281
SCE | Fair Value, Measurements, Recurring |  |
Fair Value |  |
Fair Value | 4,889 | 5,039
SCE | Fair Value, Measurements, Recurring | Municipal bonds |  |
Fair Value |  |
Fair Value | 1,033 | 1,218
SCE | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value |  |
Fair Value | 1,212 | 864
SCE | Fair Value, Measurements, Recurring | Corporate bonds |  |
Fair Value |  |
Fair Value |  | 550
SCE | Fair Value, Measurements, Recurring | Short-term investments and receivables/payables |  |
Fair Value |  |
Fair Value | $ 207 | $ 293

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