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Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2013
Equity [Abstract]  
Components of AOCI
Midwest Generation's AOCI, net of tax, consisted of:
(in millions)
Unrealized Gains and Losses on Cash Flow Hedges
 
Unrecognized Loss and Prior Service Adjustments, Net1
 
Valuation Allowance on Deferred Tax Asset
 
AOCI
Balance at December 31, 2012
$
(1
)
 
$
(37
)
 
$
(12
)
 
$
(50
)
OCI before reclassifications
(1
)
 
—

 
—

 
(1
)
Amount reclassified from AOCI
2

 
2

 
—

 
4

Balance at September 30, 2013
$
—

 
$
(35
)
 
$
(12
)
 
$
(47
)
1 
For further detail, see Note 8—Compensation and Benefit Plans.
EME's AOCI, net of tax and including discontinued operations, consisted of:
(in millions)
Unrealized Gains and Losses on Cash Flow Hedges
 
Unrecognized Loss and Prior Service Adjustments, Net1
 
Valuation Allowance on Deferred Tax Asset
 
AOCI
Balance at December 31, 2012
$
(76
)
 
$
(56
)
 
$
(6
)
 
$
(138
)
OCI before reclassifications
23

 
(2
)
 
—

 
21

Amount reclassified from AOCI
5

 
3

 
—

 
8

Balance at September 30, 20132
$
(48
)
 
$
(55
)
 
$
(6
)
 
$
(109
)
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, see "—Unrealized Losses on Cash Flow Hedges."
Reclassifications out of AOCI
EME's significant items reclassified out of AOCI and the effect on the statement of operations consisted of:
(in millions)
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
Affected Line Item in the Statement of Operations
Unrealized gains and losses on cash flow hedges
 
 
 
 
 
Electricity commodity hedges
$
(5
)
 
$
(4
)
 
Operating revenues
Interest rate contracts
(6
)
 
(4
)
 
Interest expense
Tax benefit
4

 
3

 
Benefit for income taxes
Total, net
$
(7
)
 
$
(5
)
 
Net loss
Amortization of retirement benefit items
 
 
 
 
 
Unamortized prior service cost on terminated plan
$
—

 
$
(2
)
 
Plant operations and administrative and general1
Actuarial losses
(2
)
 
(3
)
 
Plant operations and administrative and general1
Tax benefit
1

 
2

 
Benefit for income taxes
Total, net
$
(1
)
 
$
(3
)
 
Net loss
1 
For the three and nine months ended September 30, 2013, $1 million and $3 million were reclassified from AOCI to plant operations, respectively, and $1 million and $2 million from AOCI to administrative and general expenses
Midwest Generation's significant items reclassified out of AOCI and the effect on the statement of operations consisted of:
(in millions)
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
Affected Line Item in the Statement of Operations
Unrealized gains and losses on cash flow hedges
 
 
 
 
 
Electricity commodity hedges
$
(5
)
 
$
(4
)
 
Operating revenues
Tax benefit
2

 
2

 
Benefit for income taxes
Total, net
$
(3
)
 
$
(2
)
 
Net loss
Amortization of retirement benefit items
 
 
 
 
 
Prior services costs
$
—

 
$
(1
)
 
Plant operations
Actuarial losses
(1
)
 
(2
)
 
Plant operations
Tax benefit
—

 
1

 
Benefit for income taxes
Total, net
$
(1
)
 
$
(2
)
 
Net loss