Summary of Significant Accounting Policies (Nuclear Decommissioning) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Asset Retirement Obligation, Roll Forward
Beginning balance	$ 2,772
Ending balance	2,754	$ 2,772
SCE
Asset Retirement Obligation, Roll Forward
Beginning balance	2,772	2,930
Accretion	143	157
Revisions	28	(77)
Liabilities settled	(189)	(238)
Ending balance	2,754	$ 2,772
SCE | Palo Verde and San Onofre Units
Asset Retirement Obligation, Roll Forward
Ending balance	2,300
Estimated cost to decommission nuclear facilities	$ 6,300
Decommissioning cost escalated rates, low end (percent)	2.30%
Decommissioning cost escalated rates, high end (percent)	7.50%
Estimated annual net of tax earnings, low end (percent)	1.60%
Estimated annual net of tax earnings, high end (percent)	4.90%