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, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Unrecognized prior service cost (credit) to be amortized	$ 11
Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Unrecognized prior service cost (credit) to be amortized	(36)
Pension Plans
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net (gain) loss	(33)	36	13
Amortization of net loss	(13)	(10)	(11)
Total recognized in other comprehensive loss	(46)	26	2
Total recognized in expense and other comprehensive income	142	205	125
Unrecognized net loss to be amortized	5
Unrecognized prior service cost (credit) to be amortized	5
Southern California Edison
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Unrecognized prior service cost (credit) to be amortized	7
Southern California Edison | Postretirement Benefits Other Than Pensions
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Unrecognized prior service cost (credit) to be amortized	(36)
Southern California Edison | Pension Plans
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net (gain) loss	(24)	20	8
Amortization of net loss	(7)	(6)	(7)
Total recognized in other comprehensive loss	(31)	14	1
Total recognized in expense and other comprehensive income	145	182	114
Unrecognized net loss to be amortized	2
Unrecognized prior service cost (credit) to be amortized	$ 5