Income Taxes (Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Line Items]
Statutory tax rate (as a percent)	21.00%		21.00%	21.00%	21.00%
Income (loss) from operations before income taxes	$ 189		$ (261)	$ 1,027	$ 119
Provision for income tax at federal statutory rate of 21%	40		(55)	216	25
(Decrease) increase in income tax from:
State tax, net of federal benefit	(16)		(58)	(16)	(79)
Property-related	(47)		(79)	(152)	(172)
Other			5	(7)	(9)
Total income tax (benefit) expense	$ (23)		$ (187)	$ 41	$ (235)
Effective tax rate	(12.20%)		(71.60%)	4.00%	(197.50%)
Increase (decrease) to previously recorded tax expense		$ 268
SCE
Income Tax Disclosure [Line Items]
Statutory tax rate (as a percent)	21.00%		21.00%	21.00%	21.00%
Income (loss) from operations before income taxes	$ 268		$ (230)	$ 1,213	$ 252
Provision for income tax at federal statutory rate of 21%	56		(48)	255	53
(Decrease) increase in income tax from:
State tax, net of federal benefit	(11)		(53)		(66)
Property-related	(47)		(79)	(152)	(172)
Other	1		3	(7)	(10)
Total income tax (benefit) expense	$ (1)		$ (177)	$ 96	$ (195)
Effective tax rate	(0.40%)		(77.00%)	7.90%	(77.40%)