Revenue (Summary) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Revenue
Total operating revenue	$ 3,968	$ 2,960
SCE
Revenue
Revenue from contracts with customers	3,360	2,899
Alternative revenue programs and other operating revenue	601	54
Total operating revenue	3,961	2,953
Receivables from contracts with customers	2,200		$ 2,300
Accrued unbilled revenues	743		$ 794
SCE | Earning Activities
Revenue
Revenue from contracts with customers	1,985	1,704
Alternative revenue programs and other operating revenue	282	63
Total operating revenue	2,267	1,767
SCE | Cost- Recovery Activities
Revenue
Revenue from contracts with customers	1,375	1,195
Alternative revenue programs and other operating revenue	319	(9)
Total operating revenue	$ 1,694	$ 1,186