Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance			$ (58)
Other	$ (1)	$ (1)	(1)	$ 1
Other comprehensive income (loss), net of tax	1	(10)	3	(10)
Ending Balance	(55)		(55)
Accumulated Defined Benefit Plans Adjustment
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance	(56)	(13)	(58)	(13)
Other comprehensive loss before reclassifications	0	(12)	(4)	(17)
Reclassified from accumulated other comprehensive income	2	3	8	6
Other	(1)	(1)	(1)	1
Other comprehensive income (loss), net of tax	1	(10)	3	(10)
Ending Balance	(55)	(23)	(55)	(23)
Southern California Edison
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance			(28)
Other	0	(1)	0	1
Other comprehensive income (loss), net of tax	1	0	3	3
Ending Balance	(25)		(25)
Southern California Edison | Accumulated Defined Benefit Plans Adjustment
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance	(26)	(8)	(28)	(11)
Other comprehensive loss before reclassifications	0	0	(1)	0
Reclassified from accumulated other comprehensive income	1	1	4	2
Other	0	(1)	0	1
Other comprehensive income (loss), net of tax	1	0	3	3
Ending Balance	$ (25)	$ (8)	$ (25)	$ (8)