Summary of Significant Accounting Policies - Changes in Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Credit Loss Roll Forward
Allowance for long-term credit losses	$ 44		$ 43
SCE
Credit Loss Roll Forward
Beginning balance	390	$ 364
Current period provision for uncollectible accounts	81	61
Write-offs, net of recoveries	(131)	(62)
Ending balance	340	363
Recovery from customers, incremental costs	66	50
Allowance for long-term credit losses	44		$ 43
SCE | Customers
Credit Loss Roll Forward
Beginning balance	372	347
Current period provision for uncollectible accounts	78	60
Write-offs, net of recoveries	(128)	(60)
Ending balance	322	347
SCE | All others
Credit Loss Roll Forward
Beginning balance	18	17
Current period provision for uncollectible accounts	3	1
Write-offs, net of recoveries	(3)	(2)
Ending balance	$ 18	$ 16