Commitments and Contingencies (Current Wildfire Insurance Coverage) (Details) - USD ($)	1 Months Ended	12 Months Ended			13 Months Ended
	Jul. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Nov. 30, 2018	Jun. 30, 2020	Feb. 28, 2019
Loss Contingencies [Line Items]
Regulatory assets		$ 6,088,000,000	$ 5,380,000,000
SCE
Loss Contingencies [Line Items]
Wildfire insurance coverage			1,000,000,000.0	$ 300,000,000
Self insurance			10,000,000
Wildfire insurance expense		400,000,000
Regulatory assets		6,088,000,000	$ 5,380,000,000
SCE | Wildfire insurance costs
Loss Contingencies [Line Items]
Regulatory assets		$ 341,000,000
SCE | California Public Utilities Commission
Loss Contingencies [Line Items]
Requested rate amount	$ 478,000,000
SCE | Revenue subject to refund | Wildfire liability insurance recovery
Loss Contingencies [Line Items]
Net regulatory assets (liabilities) pertaining to balancing accounts						$ 107,000,000
SCE | Forecast
Loss Contingencies [Line Items]
Wildfire insurance coverage					$ 1,200,000,000
Co-insurance					115,000,000
Self insurance					50,000,000
Coverage net					$ 1,000,000,000.0