Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance					$ (13)
Other	(1)		0		1		0
Other comprehensive income (loss), net of tax	(10)		3		(10)		8
Ending Balance	(23)				(23)
Southern California Edison
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance					(11)
Other	(1)		0		1		0
Other comprehensive income (loss), net of tax	0		2		3		1
Ending Balance	(8)				(8)
Accumulated Defined Benefit Plans Adjustment
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance	(13)		(82)		(13)		(87)
Other comprehensive loss before reclassifications	(12)		0		(17)		(2)
Reclassified from accumulated other comprehensive income	3	[1]	3	[1]	6	[1]	10	[1]
Other	(1)		0		1		0
Other comprehensive income (loss), net of tax	(10)		3		(10)		8
Ending Balance	(23)		(79)		(23)		(79)
Accumulated Defined Benefit Plans Adjustment | Southern California Edison
Increase (Decrease) in Accumulated Other Comprehensive Loss
Beginning balance	(8)		(30)		(11)		(29)
Other comprehensive loss before reclassifications	0		0		0		(4)
Reclassified from accumulated other comprehensive income	1	[1]	2	[1]	2	[1]	5	[1]
Other	(1)		0		1		0
Other comprehensive income (loss), net of tax	0		2		3		1
Ending Balance	$ (8)		$ (28)		$ (8)		$ (28)

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