Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance					$ (13)
Other	2		0		2		0
Other comprehensive income (loss), net of tax	(2)		5		0		5
Ending Balance	(13)				(13)
Southern California Edison
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance					(11)
Other	2		0		2		0
Other comprehensive income (loss), net of tax	2		2		3		(1)
Ending Balance	(8)				(8)
Accumulated Defined Benefit Plans Adjustment
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance	(11)		(87)		(13)		(87)
Other comprehensive loss before reclassifications	(5)		0		(5)		(2)
Reclassified from accumulated other comprehensive income	1	[1]	5	[1]	3	[1]	7	[1]
Other	2		0		2		0
Other comprehensive income (loss), net of tax	(2)		5		0		5
Ending Balance	(13)		(82)		(13)		(82)
Accumulated Defined Benefit Plans Adjustment | Southern California Edison
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance	(10)		(32)		(11)		(29)
Other comprehensive loss before reclassifications	0		0		0		(4)
Reclassified from accumulated other comprehensive income	0	[1]	2	[1]	1	[1]	3	[1]
Other	2		0		2		0
Other comprehensive income (loss), net of tax	2		2		3		(1)
Ending Balance	$ (8)		$ (30)		$ (8)		$ (30)

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