Commitments and Contingencies (Wildfires litigation) (Details) $ in Millions	1 Months Ended			2 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2021 USD ($)	Jan. 31, 2021 $ / claim	Oct. 31, 2020 USD ($) $ / claim	Apr. 30, 2021 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($) plaintiff	Dec. 31, 2020 USD ($)
2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Payments						$ 3,914
Charge for wildfire-related claims						1,734	$ 4,383
Increase in accrued estimated losses to reflect best estimate						1,265	1,297
Expected revenue from FERC customers						67	84
Total pre-tax charge						1,198	1,213
Total after-tax charge						894	874
2017/2018 Wildfire/Mudslide Events | Settled Litigation
Loss Contingencies [Line Items]
Charge for wildfire-related claims						131
2017/2018 Wildfire/Mudslide Events | Pending Litigation
Loss Contingencies [Line Items]
Charge for wildfire-related claims						1,600
2017/2018 Wildfire/Mudslide Events | Aggregate
Loss Contingencies [Line Items]
Payments						5,700
2019/2020 Wildfires
Loss Contingencies [Line Items]
Charge for wildfire-related claims						$ 123
SCE | 2017/2018 Wildfire/Mudslide Events | SED Settlement
Loss Contingencies [Line Items]
Charge for wildfire-related claims	$ 550
Fine to State	110
Shareholder-funded safety measures costs	65
Third-party uninsured claims cost recovery waiver	$ 375
SCE | 2017/2018 Wildfire/Mudslide Events | Local Public Entity Settlements
Loss Contingencies [Line Items]
Payments					$ 360
SCE | 2017/2018 Wildfire/Mudslide Events | TKM Subrogation Settlement
Loss Contingencies [Line Items]
Payments			$ 1,200
Payment agreement for each dollar of claim | $ / claim			0.555
SCE | 2017/2018 Wildfire/Mudslide Events | Individual Plaintiff Settlements
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff						5,000
Payments						$ 1,700	$ 300
SCE | 2017/2018 Wildfire/Mudslide Events | Aggregate
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate						$ 7,500
SCE | November 2018 Wildfires | Woolsey Subrogation Settlement
Loss Contingencies [Line Items]
Payments				$ 2,200
Payment agreement for each dollar of claim | $ / claim		0.67