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Investments (Gains and Losses on Equity Investments) (Details) - SCE - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investment Holdings [Line Items] |  |  |
Gross realized gains | $ 255 | $ 87 | $ 134
Gross realized losses | (6) | (2) | (27)
Net unrealized gains (losses) for equity securities | $ 176 | $ 343 | $ (233)

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