Income Taxes (Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Line Items]
Statutory tax rate (as a percent)		21.00%
Income from operations before income taxes		$ 662	$ 789	$ 566
Provision for income tax at federal statutory rate of 21%		139	166	119
Increase (decrease) in income tax from:
State tax, net of federal benefit		(70)	(47)	(61)
Property-related		(219)	(233)	(320)
Change related to uncertain tax position			(147)	(15)
Wildfire related charges			31
Average rate assumption method ("ARAM") adjustment			87
Corporate-owned life insurance cash surrender value		(9)	(8)	(8)
Other		(3)	15	(20)
Total income tax expense (benefit)		$ (162)	$ (136)	$ (305)
Effective tax rate (as a percent)		(24.50%)	(17.20%)	(53.90%)
SCE
Income Tax Disclosure [Line Items]
Income from operations before income taxes		$ 845	$ 952	$ 665
Provision for income tax at federal statutory rate of 21%		177	200	140
Increase (decrease) in income tax from:
State tax, net of federal benefit		(57)	(33)	(52)
Property-related		(219)	(233)	(320)
Change related to uncertain tax position			(37)	(19)
Wildfire related charges			31
Average rate assumption method ("ARAM") adjustment	$ 87		87
Corporate-owned life insurance cash surrender value		(9)	(8)	(8)
Other		(1)	10	(18)
Total income tax expense (benefit)		$ (109)	$ 17	$ (277)
Effective tax rate (as a percent)		(12.90%)	1.80%	(41.70%)