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Investments (Trust Info) (Details) - SCE - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Investment Holdings [Line Items] |  |
Unrealized holding gains, net of losses | $ 1,900 | $ 2,100
Deferred income taxes related to unrealized gains | 511 | 515
Nuclear decommissioning trusts, net of deferred tax | $ 4,300 | $ 4,300

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