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Investments (Gains and Losses on Equity Investments) (Details) - SCE - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investment Holdings [Line Items] |  |  |
Gross realized gains | $ 87 | $ 134 | $ 244
Gross realized losses | (2) | (27) | (23)
Net unrealized gains (losses) for equity securities | $ 343 | $ (233) | $ 142

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