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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2012
Related Party Transactions [Abstract]  
Notes receivable from related parties
The impact to Midwest Generation's balance sheet was as follows:
 
December 31, 2012
 
December 31, 2011
(in millions)
Carrying Value
Valuation Allowance
Net
 
 
Carrying Value
 
Due from affiliates
$
12

$
(12
)
$
—

 
 
$
11

 
Interest receivable from affiliate
55

(55
)
—

 
 
55

 
Notes receivable from affiliate
1,311

(1,311
)
—

 
 
1,323

 
Total
$
1,378

$
(1,378
)
$
—

 
 
$
1,389