Summary of Significant Accounting Policies (Nuclear Decommissioning) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Asset Retirement Obligation, Roll Forward
Beginning balance	$ 2,754
Ending balance	2,666	$ 2,754
SCE
Asset Retirement Obligation, Roll Forward
Beginning balance	2,754	2,772
Accretion	144	143
Revisions	(3)	28
Liabilities settled	(229)	(189)
Ending balance	2,666	$ 2,754
SCE | Palo Verde and San Onofre Units
Asset Retirement Obligation, Roll Forward
Ending balance	2,200
Estimated cost to decommission nuclear facilities	$ 6,100
Decommissioning cost escalated rates, low end (percent)	2.20%
Decommissioning cost escalated rates, high end (percent)	7.50%
Estimated annual net of tax earnings, low end (percent)	3.10%
Estimated annual net of tax earnings, high end (percent)	6.10%