Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits
Beginning balance	$ 646	$ 613	$ 679
Tax positions taken during the current year, Increases	65	54	53
Tax positions taken during a prior year, Increases	13		3
Tax positions taken during a prior year, decreases	(294)	(21)	(118)
Settlements with taxing authorities			(4)
Ending balance	430	646	613
Unrecognized tax benefits that would impact the effective tax rate	80
SCE
Reconciliation of Unrecognized Tax Benefits
Beginning balance	374	340	320
Tax positions taken during the current year, Increases	65	54	53
Tax positions taken during a prior year, Increases	4		1
Tax positions taken during a prior year, decreases	(25)	(20)	(29)
Settlements with taxing authorities			(5)
Ending balance	418	$ 374	$ 340
Unrecognized tax benefits that would impact the effective tax rate	$ 68