Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension and PBOP – net loss:
Other	$ 0	$ (5)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(50)	(43)
Pension and PBOP – net loss:
Ending Balance	(58)	(46)
Accumulated Defined Benefit Plans Adjustment
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss1	2	2
Other	(10)	(5)
Change	(8)	(3)
Southern California Edison
Pension and PBOP – net loss:
Other	0	(5)
Southern California Edison | Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(23)	(19)
Pension and PBOP – net loss:
Ending Balance	(27)	(22)
Southern California Edison | Accumulated Defined Benefit Plans Adjustment
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss1	1	2
Other	(5)	(5)
Change	$ (4)	$ (3)