Summary of Significant Accounting Policies (Deferred Financing) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Regulatory Assets [Line Items]
Regulatory assets	$ 8,181	$ 7,660
Unamortized debt issuance expense	178	153
Amortization of deferred financing costs charged to interest expense	37	34	$ 32
SCE
Regulatory Assets [Line Items]
Regulatory assets	8,181	7,660
Unamortized debt issuance expense	165	143
Amortization of deferred financing costs charged to interest expense	31	29	$ 27
SCE | Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets	$ 109	$ 121