Commitments and Contingencies (Wildfires and Mudslides) (Details) - SCE $ in Millions	1 Months Ended
	Sep. 30, 2020 USD ($) a item individual	Oct. 31, 2019 a item individual	Nov. 30, 2018 a item individual	Jan. 31, 2018 individual item	Dec. 04, 2017 a individual item
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
Bobcat fire
Loss Contingencies [Line Items]
Acres burned | a	116,000
Number of injured firefighters | individual	6
Estimated fire suppression costs | $	$ 80
Bobcat fire | Homes
Loss Contingencies [Line Items]
Structures destroyed	87
Structures damaged	28
Bobcat fire | Commercial property
Loss Contingencies [Line Items]
Structures destroyed	1
Bobcat fire | Minor structures
Loss Contingencies [Line Items]
Structures destroyed	83
Structures damaged	19
December 2017 Wildfires
Loss Contingencies [Line Items]
Acres burned | a					280,000
Structures destroyed					1,343
Fatalities | individual					2
November 2018 Wildfires
Loss Contingencies [Line Items]
Acres burned | a			100,000
Structures destroyed			1,643
Structures damaged			364
Fatalities | individual			3
Additional fatalities | individual			4
Montecito Mudslides
Loss Contingencies [Line Items]
Structures destroyed				135
Structures damaged				324
Fatalities | individual				21
Additional fatalities presumed | individual				2