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Investments (Trust gain loss) (Details) - SCE - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Investment Holdings [Line Items] |  |  |  |
Gross realized gains | $ 77 | $ 51 | $ 328 | $ 165
Gross realized losses | (5) | (2) | (21) | (5)
Net unrealized gains (losses) for equity securities | $ (74) | $ 110 | $ (41) | $ 5

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