Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Increase (Decrease) in Accumulated Other Comprehensive Income
Beginning balance		$ (58)	$ (13)
Other		0	2
Change		2	(45)
Ending balance		(56)	(58)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Increase (Decrease) in Accumulated Other Comprehensive Income
Other comprehensive income (loss) before reclassifications		(8)	(58)
Reclassified from accumulated other comprehensive loss	[1]	10	11
Southern California Edison
Increase (Decrease) in Accumulated Other Comprehensive Income
Beginning balance		(28)	(11)
Other		0	2
Change		6	(17)
Ending balance		(22)	(28)
Southern California Edison | Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Increase (Decrease) in Accumulated Other Comprehensive Income
Other comprehensive income (loss) before reclassifications		1	(21)
Reclassified from accumulated other comprehensive loss	[1]	$ 5	$ 2

[1] These items are included in the computation of net periodic pension and PBOP expense. See Note 8 for additional information.