Summary of Significant Accounting Policies (Allowance) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Credit Loss Roll Forward
Wildfire Insurance Fund expense	$ 36	$ 54	$ 109	$ 159
Asset retirement obligation increase (decrease)	(59)
Wildfire Insurance Fund
Credit Loss Roll Forward
Insurance fund contribution amortization period			20 years		15 years
SCE
Credit Loss Roll Forward
Beginning balance	364	343	$ 364	354	$ 354
Current period provision for uncollectible accounts	90	30	208	71
Write-offs, net of recoveries	(78)	(28)	(196)	(80)
Ending balance	376	345	376	345	364
Recovery from customers, incremental costs	74	17	170	44
Allowance for long-term credit losses	36		36		4
Wildfire Insurance Fund expense	36	54	109	159
SCE | Customers
Credit Loss Roll Forward
Beginning balance	349	326	347	334	334
Current period provision for uncollectible accounts	90	25	204	65
Write-offs, net of recoveries	(75)	(22)	(187)	(70)
Ending balance	364	329	364	329	347
SCE | All others
Credit Loss Roll Forward
Beginning balance	15	17	17	20	20
Current period provision for uncollectible accounts		5	4	6
Write-offs, net of recoveries	(3)	(6)	(9)	(10)
Ending balance	$ 12	$ 16	$ 12	$ 16	$ 17