Commitments and Contingencies (Power Purchase Agreement - Operating and Capital Leases) (Details) (Southern California Edison, USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Operating Leases
Operating Leases
2015	$ 473
2016	373
2017	361
2018	258
2019	194
Thereafter	1,921
Total future commitments	3,580
Capital Leases
Capital Leases
2015	33
2016	33
2017	33
2018	33
2019	33
Thereafter	323
Total future commitments	488
Amount representing executory costs	(111)
Amount representing interest	(174)
Net commitments	$ 203