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Investments (Gains and Losses on Equity Investments) (Details) - SCE - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Investment Holdings [Line Items] |  |  |
Gross realized gains | $ 134 | $ 244 | $ 92
Gross realized losses | (27) | (23) | (19)
Net unrealized (losses) gains for equity securities | $ (233) | $ 142 | $ 75

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