Commitments and Contingencies (Wildfire Insurance Coverage) (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Aug. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Jul. 31, 2019
Loss Contingencies [Line Items]
Wildfire insurance expense			$ 450	$ 450
SCE
Loss Contingencies [Line Items]
Potential impairment			186
Regulatory assets		$ 8,434	9,438	8,434
Wildfire insurance coverage			1,000
Co-insurance			75
Self insurance			50
Coverage net			875
Wildfire insurance expense			425
Revenue requirement wildfire insurance expense	$ 460
Requested increase (decrease) in revenue requirement		214
SCE | Wildfire insurance costs
Loss Contingencies [Line Items]
Requested increase (decrease) in revenue requirement		204
2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate			1,265	1,297
2017/2018 Wildfire/Mudslide Events | SCE
Loss Contingencies [Line Items]
Expected insurance recoveries		$ 708		708
Insurance settlements and recoveries			708
Restoration capital expenditures					$ 60
Denied rate increase	8
Potential impairment			186
Expected FERC cumulative recoveries			300
Regulatory assets			165
Wildfire insurance coverage			1,000
Self insurance			10
2017/2018 Wildfire/Mudslide Events | SCE | Aggregate
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate			7,500
Litigation settlement			5,900
Insurance settlements and recoveries			2,000
November 2018 Wildfires
Loss Contingencies [Line Items]
Litigation settlement				$ 2,212
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