Commitments and Contingencies (Schedule of Estimated Losses) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended		24 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019
Loss Contingency Accrual [Roll Forward]
Beginning balance			$ 4,669
Ending balance	$ 4,568	$ 4,669	4,568	$ 4,669	$ 4,568
Charge for wildfire-related claims	4,568	4,669	4,669	4,669	4,568
2017/2018 Wildfire/Mudslide Events
Loss Contingency Accrual [Roll Forward]
Beginning balance			4,669
Accrued losses			232
Payments			(360)
Ending balance	4,541	4,669	4,541	4,669	4,541
Charge for wildfire-related claims	4,541	4,669	4,541	4,669	4,541
SCE
Loss Contingency Accrual [Roll Forward]
Beginning balance			4,669
Ending balance	4,568	4,669	4,568	4,669	4,568
Charge for wildfire-related claims	4,568	4,669	4,669	4,669	4,568
SCE | 2017/2018 Wildfire/Mudslide Events
Loss Contingency Accrual [Roll Forward]
Beginning balance			4,700
Accrued losses	232	2,500	232	4,669	4,900
Payments	(360)		(360)
Ending balance	4,500	4,700	4,500	4,700	4,500
Charge for wildfire-related claims	$ 4,500	$ 4,700	4,500	4,700	$ 4,500
Expected insurance recoveries			0	(2,000)
Expected revenue from FERC customers			(14)	(135)
Total pre-tax charge			218	2,534
Income tax benefit			(61)	(709)
Total after-tax charge			$ 157	$ 1,825