Income Taxes (Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Line Items]
Statutory tax rate (as a percent)	21.00%	21.00%
(Loss) income from operations before income taxes	$ (61)	$ 378
Provision for income tax at federal statutory rate of 21%	(13)	79
(Decrease) increase in income tax from:
State tax, net of federal income tax effect	(37)	(1)
Property-related	(55)	(58)
Other	(8)	(7)
Total income tax (benefit) expense	$ (113)	$ 13
Effective tax rate	185.20%	3.40%
SCE
Income Tax Disclosure [Line Items]
(Loss) income from operations before income taxes	$ 22	$ 428
Provision for income tax at federal statutory rate of 21%	5	90
(Decrease) increase in income tax from:
State tax, net of federal income tax effect	(31)	3
Property-related	(55)	(58)
Other	(3)	(6)
Total income tax (benefit) expense	$ (84)	$ 29
Effective tax rate	(381.80%)	6.80%