Income Taxes (Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Line Items]
Statutory tax rate (as a percent)		21.00%
Income from operations before income taxes		$ 789	$ 566	$ 1,127
Provision for income tax at federal statutory rate of 21%		166	119	237
Increase (decrease) in income tax from:
State tax, net of federal benefit		(47)	(61)	(22)
Property-related		(233)	(320)	(303)
Change related to uncertain tax position		(147)	(15)
Deferred tax re-measurement				(88)
2018 GRC Final Decision				(80)
Wildfire related charges		31
Average rate assumption method ("ARAM") adjustment		87
Corporate-owned life insurance cash surrender value		(8)	(8)	(8)
Other		15	(20)	(14)
Total income tax (benefit) expense		$ (136)	$ (305)	$ (278)
Effective tax rate (as a percent)		(17.20%)	(53.90%)	(24.70%)
SCE
Income Tax Disclosure [Line Items]
Income from operations before income taxes		$ 952	$ 665	$ 1,301
Provision for income tax at federal statutory rate of 21%		200	140	273
Increase (decrease) in income tax from:
State tax, net of federal benefit		(33)	(52)	(13)
Property-related		(233)	(320)	(303)
Change related to uncertain tax position		(37)	(19)
Deferred tax re-measurement				(88)
2018 GRC Final Decision				(80)
Wildfire related charges		31
Average rate assumption method ("ARAM") adjustment	$ 87	87
Corporate-owned life insurance cash surrender value		(8)	(8)	(8)
Other		10	(18)	(10)
Total income tax (benefit) expense		$ 17	$ (277)	$ (229)
Effective tax rate (as a percent)		1.80%	(41.70%)	(17.60%)