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Investments (Nuclear Decommissioning Trusts) (Details) - SCE - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investment Holdings [Line Items] |  |
Unrealized holding gains, net of losses | $ 2,100 | $ 1,800
Deferred income taxes related to unrealized gains | 515 | 449
Nuclear decommissioning trusts | $ 4,300 | $ 4,100

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- Definition Debt and Equity Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax + References No definition available. + Details
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