Compensation and Benefit Plans (Changes in Plan Assets and Benefits Obligations Recognized in OCI) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Unrecognized net loss to be amortized	$ 23
Unrecognized prior service cost to be amortized	(12)
Pension Plans
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net (gain) loss	85		(33)	36
Amortization of net loss and other	(13)		(13)	(10)
Total recognized in other comprehensive loss	72		(46)	26
Total recognized in expense and other comprehensive loss	223		142	205
Unrecognized net loss to be amortized	34	[1]
Unrecognized prior service cost to be amortized	5
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year	12
Southern California Edison | Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Unrecognized net loss to be amortized	23
Unrecognized prior service cost to be amortized	(12)
Southern California Edison | Pension Plans
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net (gain) loss	37		(24)	20
Amortization of net loss and other	(4)		(7)	(6)
Total recognized in other comprehensive loss	33		(31)	14
Total recognized in expense and other comprehensive loss	174		145	182
Unrecognized net loss to be amortized	30	[1]
Unrecognized prior service cost to be amortized	5
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year	$ 8

[1] The amount of net loss expected to be reclassified from other comprehensive loss for Edison International's continuing operations and SCE is $12 million and $8 million, respectively.