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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2012
Income Tax Disclosure [Abstract]  
Reconciliation of Income Tax Expense
The table below provides a reconciliation of income tax benefit computed at the federal statutory income tax rate to the income tax benefit:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(in millions)
2012
 
2011
 
2012
 
2011
Loss from continuing operations before income taxes
$
(203
)
 
$
(88
)
 
$
(375
)
 
$
(151
)
Benefit for income taxes at federal statutory rate of 35%
$
(71
)
 
$
(30
)
 
$
(131
)
 
$
(53
)
Increase (decrease) in income tax from
 
 
 
 
 
 
 
State tax-net of federal benefit
(6
)
 
(4
)
 
(21
)
 
(9
)
Production tax credits, net
(17
)
 
(18
)
 
(36
)
 
(36
)
Taxes on income allocated to noncontrolling interests
(5
)
 
(1
)
 
(4
)
 
(1
)
Other
—

 
(4
)
 
2

 
(3
)
Total benefit for income taxes from continuing operations
$
(99
)
 
$
(57
)
 
$
(190
)
 
$
(102
)
Effective tax rate
49
%
 
65
%
 
51
%
 
68
%