Commitments and Contingencies (Current Wildfire Insurance Coverage) (Details) - USD ($)	1 Months Ended		12 Months Ended			13 Months Ended
	Dec. 31, 2020	Jul. 31, 2019	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Loss Contingencies [Line Items]
Wildfire insurance expense				$ 450,000,000	$ 400,000,000
SCE
Loss Contingencies [Line Items]
Wildfire insurance coverage					1,000,000,000.0	$ 1,200,000,000
Co-insurance						115,000,000
Self insurance					$ 10,000,000	50,000,000
Coverage net						$ 1,000,000,000.0
SCE | CPUC
Loss Contingencies [Line Items]
Requested increase rate amount	$ 214,000,000	$ 505,000,000
Authorized recovery		$ 505,000,000
Collection period		2 years
SCE | CPUC | 2018 GRC
Loss Contingencies [Line Items]
Requested increase rate amount	$ 204,000,000	$ 478,000,000
SCE | Forecast
Loss Contingencies [Line Items]
Wildfire insurance coverage			$ 1,000,000,000.0
Co-insurance			80,000,000
Self insurance			50,000,000
Coverage net			$ 870,000,000