Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits
Beginning balance	$ 679	$ 370	$ 338
Tax positions taken during the current year, Increases	53	55	46
Tax positions taken during a prior year, Increases	3	274	6
Tax positions taken during a prior year, decreases	(118)	(20)	(20)
Settlements with taxing authorities	(4)
Ending balance	613	679	370
Unrecognized tax benefits that would impact the effective tax rate	344
SCE
Reconciliation of Unrecognized Tax Benefits
Beginning balance	320	282	249
Tax positions taken during the current year, Increases	53	56	47
Tax positions taken during a prior year, Increases	1	4	6
Tax positions taken during a prior year, decreases	(29)	(22)	(20)
Settlements with taxing authorities	(5)
Ending balance	340	$ 320	$ 282
Unrecognized tax benefits that would impact the effective tax rate	$ 71