Summary of Significant Accounting Policies (Allowance) (Details) - SCE - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 343	$ 381	$ 354	$ 309
Accounts Receivable, Regulatory Assets, Credit Loss Expense (Reversal)	17	57	44	115
Current period provision for uncollectible accounts	30	71	71	171
Write-offs, net of recoveries	(28)	(26)	(80)	(54)
Ending balance	345	426	345	426
Allowance for long-term uncollectible accounts	5		5		$ 7
Customers
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	326	364	334	293
Current period provision for uncollectible accounts	25	69	65	160
Write-offs, net of recoveries	(22)	(24)	(70)	(44)
Ending balance	329	409	329	409
All others
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	17	17	20	16
Current period provision for uncollectible accounts	5	2	6	11
Write-offs, net of recoveries	(6)	(2)	(10)	(10)
Ending balance	$ 16	$ 17	$ 16	$ 17