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Investments (Nuclear Decommissioning Trusts) (Details) - Southern California Edison - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Investment Holdings [Line Items] |  |
Unrealized holding gains, net of losses | $ 1,600 | $ 1,400
Other-than-temporary impairments | 162 | 170
Deferred income taxes related to unrealized gains | 366 | 323
Nuclear decommissioning trusts | $ 3,900 | $ 3,800

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- Details
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