Commitments and Contingencies (Other Commitments) (Details) (Southern California Edison, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Nuclear fuel supply contracts1
Other Commitments
2013	$ 170	[1]
2014	76	[1]
2015	76	[1]
2016	126	[1]
2017	95	[1]
Thereafter	369	[1]
Total	912	[1]
Other fuel supply contracts
Other Commitments
2013	42
2014	60
2015	86
2016	48
2017	0
Thereafter	0
Total	236
Other contractual obligations
Other Commitments
2013	32
2014	38
2015	38
2016	19
2017	15
Thereafter	271
Total	$ 413

[1] These supply contracts are under review as part of events at San Onofre. See "—Contingencies—San Onofre Outage, Inspection and Repair Issues" below for further information.