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Accumulated Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2011
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss) consisted of the following:
(in millions)
Unrealized
Gains (Losses)on Cash
Flow Hedges
 
Unrecognized
Losses and Prior Service
Adjustments, Net1
 
Accumulated
Other
Comprehensive
Income (Loss)
Balance at December 31, 2009
$
105

 
$
(27
)
 
$
78

Change for 2010
(89
)
 
(20
)
 
(109
)
Balance at December 31, 2010
16

 
(47
)
 
(31
)
Change for 2011
(50
)
 
(13
)
 
(63
)
Balance at December 31, 2011
$
(34
)
 
$
(60
)
 
$
(94
)
1 
For further detail, see Note 8—Compensation and Benefit Plans.
Included in accumulated other comprehensive loss at December 31, 2011 was $21 million, net of tax, of unrealized gains on commodity-based cash flow hedges; and $55 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 $22 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.