Commitments and Contingencies (Southern California Wildfires and Mudslides) (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended	13 Months Ended	31 Months Ended
	Jul. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Nov. 30, 2018 USD ($) a structure fatality	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jan. 31, 2019 claim	Jan. 31, 2018 structure fatality	Dec. 04, 2017 a fatality structure
Loss Contingencies [Line Items]
Estimated losses		$ 4,568		$ 4,561		$ 4,561	$ 4,561
San Onofre OII
Loss Contingencies [Line Items]
Derivative lawsuits | claim								2
2017/2018 Wildfire/Mudslide Event
Loss Contingencies [Line Items]
Estimated losses		4,541		4,528		4,528	4,528
Expected insurance recoveries				1,600		1,600	1,600
Expected revenue from FERC customers				77		77	77
Payments				13
Accrued losses				$ 0
Southern California Edison
Loss Contingencies [Line Items]
High fire risk service area, percent				27.00%
Estimated losses		4,568		$ 4,561		4,561	4,561
Wildfire-specific insurance coverage					$ 1,000	1,200
Self-insured retention				10		50
Southern California Edison | CPUC
Loss Contingencies [Line Items]
Requested rate increase	$ 478
Southern California Edison | Thomas and Koenigstein Fires
Loss Contingencies [Line Items]
Acres burned | a										280,000
Structures destroyed | structure										1,343
Fatalities | fatality										2
Southern California Edison | Thomas and Koenigstein Fires | CPUC
Loss Contingencies [Line Items]
Requested rate increase	$ 6
Southern California Edison | Woolsey Fire
Loss Contingencies [Line Items]
Acres burned | a					100,000
Structures destroyed | structure					1,643
Fatalities | fatality					3
Structures damaged | structure					364
Additional fatalities | fatality					2
Wildfire-specific insurance coverage				1,000
Self-insured retention				10
Southern California Edison | Montecito Mudslides
Loss Contingencies [Line Items]
Structures destroyed | structure									135
Fatalities | fatality									21
Structures damaged | structure									324
Additional presumed fatalities | fatality									2
Southern California Edison | 2017/2018 Wildfire/Mudslide Event
Loss Contingencies [Line Items]
Estimated losses		4,500		4,500		4,500	4,500
Expected insurance recoveries		1,710		1,637		1,637	1,637
Expected revenue from FERC customers		149		77		$ 77	77
Payments		$ 360	$ 16
Accrued losses							4,900
Payments and settlements							376
Insurance recoveries				$ 73			$ 363