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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Components of Accumulated Other Comprehensive Loss
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.
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.