Compensation and Benefit Plans (Changes in Plan Assets and Benefits Obligations Recognized in OCI) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Unrecognized prior service cost to be amortized		$ (3)
Pension Plans
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net loss (gain)		7	$ 85	$ (33)
Amortization of net loss and other		(15)	(13)	(13)
Total recognized in other comprehensive loss		(8)	72	(46)
Total recognized in expense and other comprehensive loss		110	223	142
Unrecognized net loss to be amortized	[1]	36
Unrecognized prior service cost to be amortized		4
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year		11
Southern California Edison | Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Unrecognized prior service cost to be amortized		(3)
Southern California Edison | Pension Plans
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net loss (gain)		(9)	37	(24)
Amortization of net loss and other		(9)	(4)	(7)
Total recognized in other comprehensive loss		(18)	33	(31)
Total recognized in expense and other comprehensive loss		93	$ 174	$ 145
Unrecognized net loss to be amortized	[1]	32
Unrecognized prior service cost to be amortized		4
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year		$ 6

[1] The amount of net loss expected to be reclassified from other comprehensive loss for Edison International's continuing operations and SCE is $11 million and $6 million, respectively.