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Commitments and Contingencies (Operating Lease Commitments) (Details) (Midwest Generation LLC, USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Midwest Generation LLC
Schedule Of Operating Lease Commitments [Line Items]
Remainder of 2013	$ 2
2014	1
2015	1
Total future minimum payments due	$ 4

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References+ Details

- Definition

Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References+ Details

- Definition

Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References+ Details