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Investments (Gains and (Losses) for Equity Securities) (Details) - Southern California Edison - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Investment Holdings [Line Items] |  |  |  |
Gross realized gains | $ 75 | $ 22 | $ 114 | $ 45
Gross realized loss | 1 | 0 | 3 | 0
Net unrealized gains (losses) for equity securities | $ 271 | $ 38 | $ (105) | $ 206

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