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Summary of Significant Accounting Policies (Deferred Financing) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Regulatory Assets |  |  |
Amortization of deferred financing costs charged to interest expense | $ 39 | $ 37 | $ 34
SCE |  |  |
Regulatory Assets |  |  |
Amortization of deferred financing costs charged to interest expense | $ 32 | $ 31 | $ 29

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