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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Components of Accumulated Other Comprehensive Loss
Midwest Generation's AOCI, net of tax, consisted of:
(in millions)
Unrealized Gains and Losses on Cash Flow Hedges
 
Unrecognized Losses and Prior Service Adjustments, Net1
 
Valuation Allowance on Deferred Tax Asset
 
AOCI
Balance at December 31, 2011
$
21

 
$
(38
)
 
$
—

 
$
(17
)
OCI before reclassifications
4

 
(1
)
 
(12
)
 
(9
)
Amount reclassified from AOCI
(26
)
 
2

 
—

 
(24
)
Balance at December 31, 2012
(1
)
 
(37
)
 
(12
)
 
(50
)
OCI before reclassifications
(1
)
 
25

 
—

 
24

Amount reclassified from AOCI
2

 
3

 
—

 
5

Balance at December 31, 2013
$
—

 
$
(9
)
 
$
(12
)
 
$
(21
)
1    For further detail, see Note 8—Compensation and Benefit Plans.
(in millions)
Unrealized Gains and Losses on Cash Flow Hedges
 
Unrecognized Losses and Prior Service Adjustments, Net1
 
Valuation Allowance on Deferred Tax Asset
 
AOCI
Balance at December 31, 2011
$
(34
)
 
$
(60
)
 
$
—

 
$
(94
)
OCI before reclassifications
(17
)
 
—

 
(6
)
 
(23
)
Amount reclassified from AOCI
(25
)
 
4

 
—

 
(21
)
Balance at December 31, 2012
(76
)
 
(56
)
 
(6
)
 
(138
)
OCI before reclassifications
34

 
33

 
—

 
67

Amount reclassified from AOCI
5

 
5

 
—

 
10

Balance at December 31, 2013
$
(37
)
 
$
(18
)
 
$
(6
)
 
$
(61
)
1 
For further detail, see Note 8—Compensation and Benefit Plans.
2 
EME and Midwest Generation do not expect to reclassify unrealized losses on cash flow hedges into earnings in the next 12 months. For further explanation, see "—Unrealized Losses on Cash Flow Hedges."
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Midwest Generation's significant items reclassified out of AOCI and the effect on the statement of operations consisted of:
(in millions)
Year Ended December 31, 2013
 
Affected Line Item in the Statement of Operations
Unrealized gains and losses on cash flow hedges
 
 
 
Electricity commodity hedges
$
(4
)
 
Operating revenues
Tax benefit
2

 
Benefit for income taxes
Total, net
$
(2
)
 
Net loss
Amortization of retirement benefit items
 
 
 
Prior services costs
$
(1
)
 
Plant operations
Actuarial losses
(3
)
 
Plant operations
Tax benefit
1

 
Provision for income taxes
Total, net
$
(3
)
 
Net loss
EME's significant items reclassified out of AOCI and the effect on the statement of operations consisted of:
(in millions)
Year Ended December 31, 2013
 
Affected Line Item in the Statement of Operations
Unrealized gains and losses on cash flow hedges
 
 
 
Electricity commodity hedges
$
(3
)
 
Operating revenues
Interest rate contracts
(5
)
 
Interest expense
Tax benefit
3

 
Benefit for income taxes
Total, net
$
(5
)
 
Net loss
Amortization of retirement benefit items
 
 
 
Unamortized prior service cost on terminated plan
$
(3
)
 
Plant operations and administrative and general1
Actuarial losses
(5
)
 
Plant operations and administrative and general1
Tax benefit
3

 
Provision for income taxes
Total, net
$
(5
)
 
Net loss
1 
For the year ended December 31, 2013, $5 million and $3 million were reclassified from AOCI to plant operations, and administrative and general expenses, respectively