Commitments and Contingencies (Wildfire Insurance Coverage) (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Aug. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Dec. 31, 2021	Jul. 31, 2019
Loss Contingencies [Line Items]
Wildfire insurance expense				$ 425
SCE
Loss Contingencies [Line Items]
Wildfire insurance coverage			$ 1,000
Self insurance			50
Regulatory assets			9,969	9,438
Co-insurance			75
Coverage net			875
Wildfire insurance expense				$ 450
Revenue requirement wildfire insurance expense	$ 460
Requested increase (decrease) revenue requirement		$ 214
SCE | Wildfire insurance costs
Loss Contingencies [Line Items]
Requested increase (decrease) revenue requirement		$ 204
2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate			416
2017/2018 Wildfire/Mudslide Events | SCE
Loss Contingencies [Line Items]
Wildfire insurance coverage			1,000
Self insurance			10
Restoration capital expenditures					$ 60
Denied rate increase	8
Potential impairment			184
Expected FERC cumulative recoveries			326
Regulatory assets			155
2017/2018 Wildfire/Mudslide Events | SCE | Aggregate
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate			7,900
Litigation settlement			6,600
Insurance settlements and recoveries			2,000
November 2018 Wildfires | SCE
Loss Contingencies [Line Items]
Wildfire insurance coverage			1,000
Self insurance			$ 10
Thomas and Rye wildfires | SCE
Loss Contingencies [Line Items]
Denied rate increase	$ 6