Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension and PBOP – net loss:
Other	$ 0	$ 0	$ 0	$ (5)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(58)	(46)	(50)	(43)
Pension and PBOP – net loss:
Ending Balance	(57)	(44)	(57)	(44)
Accumulated Defined Benefit Plans Adjustment
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss1	1	2	3	4
Other	0	0	(10)	(5)
Change	1	2	(7)	(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	(27)	(22)	(23)	(19)
Pension and PBOP – net loss:
Ending Balance	(26)	(21)	(26)	(21)
Southern California Edison | Accumulated Defined Benefit Plans Adjustment
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss1	1	1	2	3
Other	0	0	(5)	(5)
Change	$ 1	$ 1	$ (3)	$ (2)