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Investments (Trust gain loss) (Details) - SCE - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Investment Holdings [Line Items] |  |  |  |
Gross realized gains | $ 74 | $ 140 | $ 89 | $ 251
Gross realized losses | 45 | 4 | 61 | 16
Net unrealized (losses) gains for equity securities | $ (332) | $ 16 | $ (432) | $ 34

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