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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2013
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 provision (benefit):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(in millions)
2013
 
2012
 
2013
 
2012
Loss from continuing operations before income taxes
$
(444
)
 
$
(133
)
 
$
(655
)
 
$
(423
)
Benefit for income taxes at federal statutory rate of 35%
$
(155
)
 
$
(47
)
 
$
(229
)
 
$
(148
)
Increase (decrease) in income tax from
 
 
 
 
 
 
 
State tax - net of federal benefit
(19
)
 
14

 
(34
)
 
(4
)
Change in valuation allowance
193

 
—

 
298

 
—

Production tax credits, net
(15
)
 
(12
)
 
(57
)
 
(48
)
Taxes on income allocated to noncontrolling interests
(1
)
 
(1
)
 
(7
)
 
(5
)
Other
—

 
(1
)
 
4

 
1

Total provision (benefit) for income taxes from continuing operations
$
3

 
$
(47
)
 
$
(25
)
 
$
(204
)
Effective tax rate
*

 
35
%
 
4
%
 
48
%
*
Not meaningful.
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
September 30,
 
Nine Months Ended
September 30,
(in millions)
2013
 
2012
 
2013
 
2012
Loss before income taxes
$
(472
)
 
$
(19
)
 
$
(619
)
 
$
(102
)
Benefit for income taxes at federal statutory rate of 35%
$
(166
)
 
$
(7
)
 
$
(217
)
 
$
(36
)
Increase (decrease) in income tax from
 
 
 
 
 
 
 
State tax, net of federal benefit
(20
)
 
(1
)
 
(28
)
 
(5
)
Change in valuation allowance
183

 
—

 
243

 
—

Other
2

 
1

 
2

 
2

Total benefit for income taxes
$
(1
)
 
$
(7
)
 
$
—

 
$
(39
)
Effective tax rate
*

 
37
%
 
*

 
38
%
*
Not meaningful.