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Accumulated Other Comprehensive Loss
 12 Months Ended
Dec. 31, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss (EME, Midwest Generation)
EME
EME consolidated accumulated other comprehensive loss, including discontinued operations, consisted of the following:
(in millions)
Unrealized
Gain (Losses) on Cash
Flow Hedges
 
Unrecognized
Losses and Prior Service
Adjustments, Net1
 
Valuation Allowance on Deferred Tax Asset
 
Accumulated
Other
Comprehensive
Loss
Balance at December 31, 2010
$
16

 
$
(47
)
 
$
—

 
$
(31
)
Change for 2011
(50
)
 
(13
)
 
—

 
(63
)
Balance at December 31, 2011
(34
)
 
(60
)
 
—

 
(94
)
Change for 2012
(42
)
 
4

 
(6
)
 
(44
)
Balance at December 31, 20122
$
(76
)
 
$
(56
)
 
$
(6
)
 
$
(138
)
1 
For further detail, see Note 8—Compensation and Benefit Plans.
2 
EME and Midwest Generation both expect to reclassify unrealized losses on cash flow hedges into earnings in the next 12 months. For further explanation, please see discussion under Midwest Generation.
The after-tax amounts recorded in accumulated other comprehensive loss at December 31, 2012 and 2011 for commodity contracts was a loss of $1 million and a gain of $21 million, respectively, and for interest rate contracts was losses of $75 million and $55 million, respectively. The maximum period over which a commodity cash flow hedge is designated is through December 31, 2013.
Midwest Generation
Midwest Generation's accumulated other comprehensive loss consisted of the following:
(in millions)
Unrealized
Gains (Losses) on Cash Flow Hedges, Net
 
Unrecognized
Losses and Prior Service
Adjustments, Net1
 
Valuation Allowance on Deferred Tax Asset
 
Accumulated
Other
Comprehensive
Loss
Balance at December 31, 2010
$
23

 
$
(26
)
 
$
—

 
$
(3
)
Change for 2011
(2
)
 
(12
)
 
—

 
(14
)
Balance at December 31, 2011
21

 
(38
)
 
—

 
(17
)
Change for 2012
(22
)
 
1

 
(12
)
 
(33
)
Balance at December 31, 2012
$
(1
)
 
$
(37
)
 
$
(12
)
 
$
(50
)
1 
For further detail, see Note 8—Compensation and Benefit Plans.
The after-tax amounts recorded in accumulated other comprehensive loss at December 31, 2012 and 2011 was a loss of $1 million and a gain of $21 million, respectively. The maximum period over which a commodity cash flow hedge is designated is December 31, 2013.
Unrealized Losses on Cash Flow Hedges
Unrealized losses on cash flow hedges, net of tax, at December 31, 2012, consisted of futures and forward electricity contracts that qualify for hedge accounting. These losses arise because current forecasts of future electricity prices are higher than the contract prices. Approximately $1 million of unrealized losses on cash flow hedges, net of tax, are expected to be reclassified into earnings during the next 12 months. Management expects that reclassification of net unrealized losses will decrease energy revenues recognized at market prices. Actual amounts ultimately reclassified into earnings over the next 12 months could vary materially from this estimated amount as a result of changes in market conditions. The maximum period over which a commodity cash flow hedge is designated is December 31, 2013.