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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Investment Holdings [Line Items] |  |  |  |
Gross realized gains | $ 22 | $ 26 | $ 45 | $ 87
Gross realized loss | 0 | (2) | 0 | (10)
Net unrealized gains (losses) for equity securities | $ 38 | $ (5) | $ 206 | $ (68)

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