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	Sep. 30, 2019	Feb. 28, 2019
Loss Contingencies [Line Items]
Regulatory assets			$ 5,380,000,000			$ 5,731,000,000
Southern California Edison
Loss Contingencies [Line Items]
Wildfire-specific insurance coverage			1,000,000,000	$ 300,000,000
Self-insured retention			10,000,000
Net regulatory asset						107,000,000
Regulatory assets			$ 5,380,000,000			5,731,000,000
Southern California Edison | CPUC
Loss Contingencies [Line Items]
Requested rate increase	$ 478,000,000
Southern California Edison | Wildfire insurance costs
Loss Contingencies [Line Items]
Regulatory assets						$ 265,000,000
Southern California Edison | Wildfire liability insurance recovery | Regulatory balancing accounts
Loss Contingencies [Line Items]
Net regulatory asset							$ 107,000,000
Southern California Edison | Forecast
Loss Contingencies [Line Items]
Wildfire-specific insurance coverage					$ 1,200,000,000
Co-Insurance per wildfire occurrence					115,000,000
Self-insured retention					50,000,000
Wildfire-specific insurance coverage, net					$ 1,000,000,000
Wildfire insurance expense		$ 400,000,000