Commitments and Contingencies (Southern California Wildfires) (Details) a in Thousands	10 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) claims	May 31, 2019 USD ($)	Dec. 31, 2017 USD ($) a fatality structure
Loss Contingencies [Line Items]
Derivative lawsuits | claims	2
Southern California Edison
Loss Contingencies [Line Items]
Wildfire-specific insurance coverage			$ 1,000,000,000
Self-insured retention	$ 10,000,000		$ 10,000,000
Southern California Edison | Forecast
Loss Contingencies [Line Items]
Wildfire-specific insurance coverage		$ 1,000,000,000
Southern California Edison | December 2017 Wildfires
Loss Contingencies [Line Items]
Acres burned | a			280
Structures destroyed | structure			1,063
Structures damaged | structure			280
Fatalities | fatality			2
Capital expenditures	$ 84,000,000