Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension and PBOP – net loss:
Other	$ 0	$ 1	$ 0	$ (4)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(57)	(44)	(50)	(43)
Pension and PBOP – net loss:
Ending Balance	(55)	(42)	(55)	(42)
Accumulated Defined Benefit Plans Adjustment
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss1	2	1	5	5
Other	0	1	(10)	(4)
Change	2	2	(5)	1
Southern California Edison
Pension and PBOP – net loss:
Other	0	0	0	(5)
Southern California Edison | Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(26)	(21)	(23)	(19)
Pension and PBOP – net loss:
Ending Balance	(25)	(20)	(25)	(20)
Southern California Edison | Accumulated Defined Benefit Plans Adjustment
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss1	1	1	3	4
Other	0	0	(5)	(5)
Change	$ 1	$ 1	$ (2)	$ (1)