Commitments and Contingencies (Current Wildfire Insurance Coverage) (Details) - USD ($)	4 Months Ended	12 Months Ended			13 Months Ended
	May 31, 2019	Dec. 31, 2019	May 31, 2019	Dec. 31, 2018	Jun. 30, 2020	Dec. 31, 2018	Feb. 28, 2019	Dec. 31, 2017
Loss Contingencies [Line Items]
Regulatory assets				$ 5,380,000,000		$ 5,380,000,000		$ 4,914,000,000
SCE
Loss Contingencies [Line Items]
Wildfire insurance coverage				1,000,000,000		300,000,000
Self insurance	$ 10,000,000		$ 10,000,000	10,000,000		10,000,000
Co-insurance	15,000,000		15,000,000
Wildfire insurance expense				237,000,000
Regulatory assets				5,380,000,000		5,380,000,000		$ 4,914,000,000
SCE | Forecast
Loss Contingencies [Line Items]
Wildfire insurance coverage	700,000,000		1,000,000,000		$ 750,000,000
Self insurance	$ 10,000,000		$ 10,000,000		10,000,000
Co-insurance					$ 115,000,000
Wildfire insurance expense		$ 321,000,000
Wildfire insurance costs | SCE
Loss Contingencies [Line Items]
Regulatory assets				$ 128,000,000		$ 128,000,000
Subsequent event | SCE
Loss Contingencies [Line Items]
Net Regulatory Assets							$ 107,000,000
Revenue subject to refund | Subsequent event | Wildfire liability insurance recovery | SCE
Loss Contingencies [Line Items]
Net Regulatory Assets							$ 107,000,000