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Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2013
Equity [Abstract]  
Components of AOCI
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
27

 
(2
)
 
—

 
25

Amount reclassified from AOCI
2

 
2

 
—

 
4

Balance at June 30, 20132
$
(47
)
 
$
(56
)
 
$
(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."
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
(2
)
 
—

 
—

 
(2
)
Amount reclassified from AOCI
1

 
1

 
—

 
2

Balance at June 30, 2013
$
(2
)
 
$
(36
)
 
$
(12
)
 
$
(50
)
1 
For further detail, see Note 8—Compensation and Benefit Plans.
Reclassifications out of AOCI
Midwest Generation's significant items reclassified out of AOCI and the effect on the statement of operations consisted of:
(in millions)
Three Months Ended June 30, 2013
 
Six Months Ended June 30, 2013
 
Affected Line Item in the Statement of Operations
Unrealized gains and losses on cash flow hedges
 
 
 
 
 
Electricity commodity hedges
$
(2
)
 
$
1

 
Operating revenues
Tax benefit
1

 
—

 
Benefit for income taxes
Total, net
$
(1
)
 
$
1

 
Net income (loss)
Amortization of retirement benefit items
 
 
 
 
 
Prior services costs
$
(1
)
 
$
(1
)
 
Plant operations
Actuarial losses
—

 
(1
)
 
Plant operations
Tax benefit
1

 
1

 
Benefit for income taxes
Total, net
$
—

 
$
(1
)
 
Net loss
EME's significant items reclassified out of AOCI and the effect on the statement of operations consisted of:
(in millions)
Three Months Ended June 30, 2013
 
Six Months Ended June 30, 2013
 
Affected Line Item in the Statement of Operations
Unrealized gains and losses on cash flow hedges
 
 
 
 
 
Electricity commodity hedges
$
(2
)
 
$
1

 
Operating revenues
Interest rate contracts
2

 
2

 
Interest expense
Tax expense
—

 
(1
)
 
Benefit for income taxes
Total, net
$
—

 
$
2

 
Net income
Amortization of retirement benefit items
 
 
 
 
 
Unamortized prior service cost on terminated plan
$
(2
)
 
$
(2
)
 
Plant operations and administrative and general1
Actuarial losses
1

 
(1
)
 
Plant operations and administrative and general1
Tax benefit
—

 
1

 
Benefit for income taxes
Total, net
$
(1
)
 
$
(2
)
 
Net loss
1 
For the three and six months ended June 30, 2013, $1 million and $2 million were reclassified from AOCI to plant operations, respectively, and none and $1 million from AOCI to administrative and general expenses