Income Taxes (Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Line Items]
Statutory tax rate (as a percent)	21.00%
Income from operations before income taxes	$ 378	$ 81
Provision for income tax at federal statutory rate of 21%	79	17
Increase (decrease) in income tax from:
State tax, net of federal benefit	(1)	(17)
Property-related	(58)	(45)
Other	(7)	(10)
Total income tax expense (benefit)	$ 13	$ (55)
Effective tax rate	3.40%	(67.90%)
SCE
Income Tax Disclosure [Line Items]
Income from operations before income taxes	$ 428	$ 133
Provision for income tax at federal statutory rate of 21%	90	28
Increase (decrease) in income tax from:
State tax, net of federal benefit	3	(13)
Property-related	(58)	(45)
Other	(6)	(10)
Total income tax expense (benefit)	$ 29	$ (40)
Effective tax rate	6.80%	(30.10%)