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Investments (Nuclear Decommissioning Trusts) (Details) - SCE - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Investment Holdings [Line Items] |  |
Unrealized holding gains, net of losses | $ 1,400 | $ 1,600
Other-than-temporary impairments | 170 | $ 143
Deferred income taxes related to unrealized gains | 323 |
Nuclear decommissioning trusts | $ 3,800 |

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