Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance			$ (58)
Other	$ 0	$ 2	0	$ 2
Other comprehensive income (loss), net of tax	3	(2)	2	0
Ending Balance	(56)		(56)
Accumulated Defined Benefit Plans Adjustment
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance	(59)	(11)	(58)	(13)
Other comprehensive loss before reclassifications	(1)	(5)	(4)	(5)
Reclassified from accumulated other comprehensive income	4	1	6	3
Other	0	2	0	2
Other comprehensive income (loss), net of tax	3	(2)	2	0
Ending Balance	(56)	(13)	(56)	(13)
Southern California Edison
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance			(28)
Other	0	2	0	2
Other comprehensive income (loss), net of tax	1	2	2	3
Ending Balance	(26)		(26)
Southern California Edison | Accumulated Defined Benefit Plans Adjustment
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance	(27)	(10)	(28)	(11)
Other comprehensive loss before reclassifications	(1)	0	(1)	0
Reclassified from accumulated other comprehensive income	2	0	3	1
Other	0	2	0	2
Other comprehensive income (loss), net of tax	1	2	2	3
Ending Balance	$ (26)	$ (8)	$ (26)	$ (8)