Summary of Significant Accounting Policies (Allowance) (Details) - SCE - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 354	$ 309
Deferred to regulatory memorandum accounts	14	41
Current period provision for uncollectible accounts	20	61
Write-offs, net of recoveries	(30)	(17)
Ending balance	344	353
Allowance for long-term uncollectible accounts	21		$ 7
Customers
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	334	293
Current period provision for uncollectible accounts	20	54
Write-offs, net of recoveries	(28)	(10)
Ending balance	326	337
All others
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	20	16
Current period provision for uncollectible accounts		7
Write-offs, net of recoveries	(2)	(7)
Ending balance	$ 18	$ 16