Commitments and Contingencies (Wildfires litigation) (Details) $ in Millions		1 Months Ended		2 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Jul. 22, 2021 lawsuit plaintiff	Jan. 31, 2021 $ / claim	Oct. 31, 2020 USD ($) $ / claim	Apr. 30, 2021 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2021 USD ($) plaintiff	Dec. 31, 2020 USD ($)	Jan. 31, 2019 claim
San Onofre OII
Loss Contingencies [Line Items]
Number of pending lawsuits | claim								2
2019/2020 Wildfires
Loss Contingencies [Line Items]
Charge for wildfire-related claims						$ 118
2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Payments						2,852
Charge for wildfire-related claims						1,531	$ 4,383
2017/2018 Wildfire/Mudslide Events | Settled Litigation
Loss Contingencies [Line Items]
Charge for wildfire-related claims						141,000
2017/2018 Wildfire/Mudslide Events | Pending Litigation
Loss Contingencies [Line Items]
Charge for wildfire-related claims						$ 1,400
Thomas and Koenigstein Fires and Montecito Mudslides
Loss Contingencies [Line Items]
Number of pending lawsuits | lawsuit	44
Thomas and Koenigstein Fires, Class Action
Loss Contingencies [Line Items]
Number of pending lawsuits | lawsuit	4
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						3,000
Payments						$ 750	$ 300
SCE | Thomas and Koenigstein Fires and Montecito Mudslides
Loss Contingencies [Line Items]
Number of pending lawsuits | lawsuit	70
SCE | December 2017 - Thomas and Koenigstein Wildfires
Loss Contingencies [Line Items]
Number of pending lawsuits | lawsuit	278
Number of plaintiffs | plaintiff	3,000
SCE | November 2018 - Woolsey Wildfires
Loss Contingencies [Line Items]
Number of pending lawsuits | lawsuit	334
Number of plaintiffs | lawsuit	6,000
SCE | November 2018 - Woolsey Wildfires | Woolsey Subrogation Settlement
Loss Contingencies [Line Items]
Payments				$ 2,200
Payment agreement for each dollar of claim | $ / claim		0.67
SCE | Woolsey Fire, Class Action
Loss Contingencies [Line Items]
Number of pending lawsuits | lawsuit	2