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Investments (Nuclear Decommissioning Trusts) (Details) - SCE - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Investment Holdings [Line Items] |  |
Unrealized holding gains, net of losses | $ 1,800 | $ 1,400
Other-than-temporary impairments | 160 | $ 170
Deferred income taxes related to unrealized gains | 449 |
Nuclear decommissioning trusts | $ 4,100 |

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