Revenue (Summary) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Revenue
Total operating revenue	$ 4,078	$ 3,966
SCE
Revenue
Revenue from contracts with customers	3,770	3,736
Alternative revenue programs and other operating revenue	294	214
Total operating revenue	4,064	3,950
Receivables from contracts with customers	2,600		$ 2,500
Accrued unbilled revenues	777		$ 741
SCE | Earning Activities
Revenue
Revenue from contracts with customers	2,175	2,076
Alternative revenue programs and other operating revenue	274	157
Total operating revenue	2,449	2,233
SCE | Cost- Recovery Activities
Revenue
Revenue from contracts with customers	1,595	1,660
Alternative revenue programs and other operating revenue	20	57
Total operating revenue	$ 1,615	$ 1,717