Commitments and Contingencies (Wildfires and Mudslides) (Details) $ in Millions	1 Months Ended			9 Months Ended		10 Months Ended	12 Months Ended
	Jan. 31, 2021 individual	Sep. 30, 2020 USD ($) a item individual	Oct. 31, 2019 a item individual	Oct. 31, 2021 item individual	Sep. 30, 2021 USD ($)	Oct. 26, 2021 item individual	Dec. 31, 2020 USD ($) individual item	Nov. 30, 2018 a individual item	Jan. 31, 2018 individual item	Dec. 04, 2017 a item individual
2019/2020 Wildfires
Loss Contingencies [Line Items]
Charge for wildfire-related claims | $					$ 123
Expected insurance recoveries | $					75
2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Charge for wildfire-related claims | $					$ 2,256		$ 4,383
SCE
Loss Contingencies [Line Items]
High fire risk service area, percent					27.00%
PSPS				7		8	12
Customers impacted by PSPS | individual	98,000			300		98,000	145,000
Regulatory assets | $					$ 8,939		$ 8,434
SCE | Saddle Ridge Fire
Loss Contingencies [Line Items]
Acres burned | a			9,000
Structures destroyed			19
Structures damaged			88
Fatalities | individual			1
Number of injured firefighters | individual			8
SCE | Bobcat fire
Loss Contingencies [Line Items]
Acres burned | a		116,000
Number of injured firefighters | individual		6
Estimated fire suppression costs | $		$ 80
SCE | Bobcat fire | Homes
Loss Contingencies [Line Items]
Structures destroyed		87
Structures damaged		28
SCE | Bobcat fire | Commercial property
Loss Contingencies [Line Items]
Structures destroyed		1
SCE | Bobcat fire | Minor structures
Loss Contingencies [Line Items]
Structures destroyed		83
Structures damaged		19
SCE | 2017/2018 Wildfire/Mudslide Events
Loss Contingencies [Line Items]
Regulatory assets | $					$ 162
Expected insurance recoveries | $							$ 708
SCE | December 2017 - Thomas and Koenigstein Wildfires
Loss Contingencies [Line Items]
Acres burned | a										280,000
Structures destroyed										1,343
Fatalities | individual										2
SCE | November 2018 - Woolsey Wildfires
Loss Contingencies [Line Items]
Acres burned | a								100,000
Structures destroyed								1,643
Structures damaged								364
Fatalities | individual								3
Additional fatalities | individual								4
SCE | Montecito Mudslides
Loss Contingencies [Line Items]
Structures destroyed									135
Structures damaged									324
Fatalities | individual									21
Additional fatalities presumed | individual									2