Summary of Significant Accounting Policies (Allowance) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Credit Loss Roll Forward
Beginning balance	$ 354	$ 309	$ 188
Current period provision for uncollectible accounts	115	122	135
Write-offs, net of recoveries	(105)	(77)	(14)
Ending balance	364	354	309
Recovery from customers, incremental costs	78	40	91
Allowance for long-term credit losses	4	7
Customers
Credit Loss Roll Forward
Beginning balance	334	293	175
Current period provision for uncollectible accounts	109	111	124
Write-offs, net of recoveries	(96)	(70)	(6)
Ending balance	347	334	293
All others
Credit Loss Roll Forward
Beginning balance	20	16	13
Current period provision for uncollectible accounts	6	11	11
Write-offs, net of recoveries	(9)	(7)	(8)
Ending balance	$ 17	$ 20	$ 16