Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Payments for Lease Payments and Lease Financing Commitments

Future minimum payments for operating leases at December 31, 2012 for EME are:

Years Ending December 31, (in millions)	Powerton and Joliet Stations1		Other Operating Leases		LSTC
2013	$	151	$	19	$	10
2014	151		17		—
2015	67		17		—
2016	26		13		—
2017	1		15		—
Thereafter	240		130		—
Total future commitments	$	636	$	211	$	10

¹  Reflects principal and interest payments related to the Powerton and Joliet Sale Leaseback.

Future minimum operating lease payments and lease financing commitments at December 31, 2012 for Midwest Generation are:

Years Ending December 31, (in millions)	Lease Financings		Operating Leases		LSTC
2013	$	7	$	8	$	129
2014	2		7		133
2015	—		7		58
2016	—		5		23
2017	—		5		—
Thereafter	—		6		101
Total future commitments	$	9	$	38	$	444
Amount representing interest	1
Net commitments	$	8

Schedule of Other Minimum Commitments

Certain other minimum commitments are estimated as follows:

(in millions)	2013		2014		2015		2016		2017
Midwest Generation
Fuel supply contracts	$	170	$	150	$	—	$	—	$	—
Coal transportation agreements1	283		276		260		260		215
Capital expenditures	25		19		17		—		—
Other contractual obligations	19		1		—		—		—
Other EME subsidiaries
Gas transportation agreements	7		7		7		8		7
Capital expenditures	24		—		—		—		—
Other contractual obligations	32		23		18		13		7
	$	560	$	476	$	302	$	281	$	229

¹  Years 2013 through 2017 reflect a reduction in minimum volumes for the voluntarily cessation of coal-fired operations at the Fisk and Crawford Stations.