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 ($)	Mar. 31, 2022 USD ($) plaintiff	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate					$ 416
Expected revenue from FERC customers					26
Total pre-tax charge					390
Total after-tax charge					281
Payments					717
Charge for wildfire-related claims					1,433		$ 1,734
2017/2018 Wildfire/Mudslide Events | Settled Litigation
Loss Contingencies [Line Items]
Charge for wildfire-related claims					137
2017/2018 Wildfire/Mudslide Events | Pending Litigation
Loss Contingencies [Line Items]
Charge for wildfire-related claims					1,300
2017/2018 Wildfire/Mudslide Events | Aggregate
Loss Contingencies [Line Items]
Payments					6,400
2019/2020 Wildfires
Loss Contingencies [Line Items]
Charge for wildfire-related claims					229
Expected insurance recoveries					171
SCE
Loss Contingencies [Line Items]
Regulatory Assets					9,969		9,438
SCE | 2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Regulatory Assets					155
SCE | 2017/2018 Wildfire/Mudslide Events | SED Settlement
Loss Contingencies [Line Items]
Charge for wildfire-related claims	$ 550
Third-party uninsured claims cost recovery waiver	375				375
Fine to State	110
Shareholder-funded safety measures costs	$ 65
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]
Payments					$ 700		$ 1,700	$ 300
Number of plaintiffs | plaintiff					7,000
SCE | 2017/2018 Wildfire/Mudslide Events | Aggregate
Loss Contingencies [Line Items]
Increase in accrued estimated losses to reflect best estimate					$ 7,900
SCE | November 2018 Wildfires | Woolsey Subrogation Settlement
Loss Contingencies [Line Items]
Payments				$ 2,200
Payment agreement for each dollar of claim | $ / claim		0.67