Summary of Significant Accounting Policies (Allowance) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Credit Loss Roll Forward
Wildfire Insurance Fund expense	$ 37	$ 53	$ 73	$ 105
Wildfire Insurance Fund
Credit Loss Roll Forward
Insurance fund contribution amortization period			20 years		15 years
SCE
Credit Loss Roll Forward
Beginning balance	363	344	$ 364	354	$ 354
Current period provision for uncollectible accounts	57	21	118	41
Write-offs, net of recoveries	(56)	(22)	(118)	(52)
Ending balance	364	343	364	343	364
Recovery from customers, incremental costs	46	13	96	27
Allowance for long-term credit losses	30		30		4
Wildfire Insurance Fund expense	37	53	73	105
SCE | Customers
Credit Loss Roll Forward
Beginning balance	347	326	347	334	334
Current period provision for uncollectible accounts	54	20	114	40
Write-offs, net of recoveries	(52)	(20)	(112)	(48)
Ending balance	349	326	349	326	347
SCE | All others
Credit Loss Roll Forward
Beginning balance	16	18	17	20	20
Current period provision for uncollectible accounts	3	1	4	1
Write-offs, net of recoveries	(4)	(2)	(6)	(4)
Ending balance	$ 15	$ 17	$ 15	$ 17	$ 17