Commitments and Contingencies (Power Purchase Agreement - Operating and Capital Leases) (Details) (Southern California Edison, USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Operating Leases
Operating Leases
2013	$ 958
2014	914
2015	933
2016	856
2017	830
Thereafter	11,688
Total future commitments	16,179
Capital Leases
Capital Leases
2013	33
2014	71
2015	109
2016	109
2017	109
Thereafter	1,642
Total future commitments	2,073
Amount representing executory costs	(438)
Amount representing interest	(752)
Net commitments	$ 883

Amount of minimum lease payments for capital leases.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph a(ii)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.