Summary of Significant Accounting Policies (Allowance) (Details) - SCE - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 344	$ 353	$ 354	$ 309
Accounts Receivable, Regulatory Assets, Credit Loss Expense (Reversal)	13	17	27	58
Current period provision for uncollectible accounts	21	39	41	100
Write-offs, net of recoveries	(22)	(11)	(52)	(28)
Ending balance	343	381	343	381
Allowance for long-term uncollectible accounts	8		8		$ 7
Customers
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	326	337	334	293
Current period provision for uncollectible accounts	20	37	40	91
Write-offs, net of recoveries	(20)	(10)	(48)	(20)
Ending balance	326	364	326	364
All others
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	18	16	20	16
Current period provision for uncollectible accounts	1	2	1	9
Write-offs, net of recoveries	(2)	(1)	(4)	(8)
Ending balance	$ 17	$ 17	$ 17	$ 17