Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Increase (Decrease) in Accumulated Other Comprehensive Loss
Balance at the beginning of period	$ (13)
Other comprehensive income (loss)	2		0
Balance at the end of period	(11)
Southern California Edison
Increase (Decrease) in Accumulated Other Comprehensive Loss
Balance at the beginning of period	(11)
Other comprehensive income (loss)	1		(3)
Balance at the end of period	(10)
Accumulated Defined Benefit Plans Adjustment
Increase (Decrease) in Accumulated Other Comprehensive Loss
Balance at the beginning of period	(13)		(87)
Other comprehensive loss before reclassifications	0		(2)
Reclassified from accumulated other comprehensive income	2	[1]	2	[1]
Other comprehensive income (loss)	2		0
Balance at the end of period	(11)		(87)
Accumulated Defined Benefit Plans Adjustment | Southern California Edison
Increase (Decrease) in Accumulated Other Comprehensive Loss
Balance at the beginning of period	(11)		(29)
Other comprehensive loss before reclassifications	0		(4)
Reclassified from accumulated other comprehensive income	1	[1]	1	[1]
Other comprehensive income (loss)	1		(3)
Balance at the end of period	$ (10)		$ (32)

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