Income Taxes (Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2023	Sep. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Line Items]
Statutory tax rate (as a percent)			21.00%	21.00%	21.00%
Income from operations before income taxes			$ 1,515	$ 662	$ 789
Provision for income tax at federal statutory rate of 21%			318	139	166
(Decrease) increase in income tax from:
State tax, net of federal income tax effect			3	(70)	(47)
Property-related			(205)	(219)	(233)
Change related to uncertain tax position					(147)
Wildfire related charges					31
Average rate assumption method ("ARAM") adjustment					87
Corporate-owned life insurance cash surrender value			(8)	(9)	(8)
Other				(3)	15
Total income tax expense (benefit)			$ 108	$ (162)	$ (136)
Effective tax rate			7.10%	(24.50%)	(17.20%)
Increase (decrease) to previously recorded tax expense	$ 268
SCE
Income Tax Disclosure [Line Items]
Income from operations before income taxes			$ 1,781	$ 845	$ 952
Provision for income tax at federal statutory rate of 21%			374	177	200
(Decrease) increase in income tax from:
State tax, net of federal income tax effect			23	(57)	(33)
Property-related			(205)	(219)	(233)
Change related to uncertain tax position					(37)
Wildfire related charges					31
Average rate assumption method ("ARAM") adjustment		$ 87			87
Corporate-owned life insurance cash surrender value			(8)	(9)	(8)
Other				(1)	10
Total income tax expense (benefit)			$ 184	$ (109)	$ 17
Effective tax rate			10.30%	(12.90%)	1.80%