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Accumulated Other Comprehensive Loss
 6 Months Ended
Jun. 30, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss consisted of the following:
(in millions)
Unrealized
Losses on Cash
Flow Hedges
 
Unrecognized
Losses and Prior Service
Adjustments, Net1
 
Accumulated
Other
Comprehensive
Loss
Balance at December 31, 2011
$
(34
)
 
$
(60
)
 
$
(94
)
Current period change
(23
)
 
2

 
(21
)
Balance at June 30, 2012
$
(57
)
 
$
(58
)
 
$
(115
)
1 
For further detail, see Note 8—Compensation and Benefit Plans.
Included in accumulated other comprehensive loss at June 30, 2012 was $12 million, net of tax, of unrealized gains on commodity-based cash flow hedges, and $69 million, net of tax, of unrealized losses related to interest rate hedges. The maximum period over which a commodity cash flow hedge is designated is through May 31, 2014.
Unrealized gains on commodity hedges consist of futures and forward electricity contracts that qualify for hedge accounting. These gains arise because current forecasts of future electricity prices in these markets are lower than the contract prices. Approximately $13 million of unrealized gains 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 gains will increase 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.