Summary of Significant Accounting Policies - Changes in Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Credit Loss Roll Forward
Allowance for long-term credit losses	$ 43	$ 4
SCE
Credit Loss Roll Forward
Beginning balance	364	354	$ 309
Current period provision for uncollectible accounts	290	115	122
Write-offs, net of recoveries	(264)	(105)	(77)
Ending balance	390	364	354
Recovery from customers, incremental costs	222	78	40
Allowance for long-term credit losses	43	4
SCE | Customers
Credit Loss Roll Forward
Beginning balance	347	334	293
Current period provision for uncollectible accounts	278	109	111
Write-offs, net of recoveries	(253)	(96)	(70)
Ending balance	372	347	334
SCE | All others
Credit Loss Roll Forward
Beginning balance	17	20	16
Current period provision for uncollectible accounts	12	6	11
Write-offs, net of recoveries	(11)	(9)	(7)
Ending balance	$ 18	$ 17	$ 20