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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]  
Factors Causing Variation in Effective Tax Rate From US Federal Statutory Rate
The differences that caused our effective income tax rates to vary from the 35% U.S. federal statutory rate for income taxes were as follows:
 
Successor
 
 
Predecessor
 
Nine Months Ended
 
 
191 Days Ended
 
Nine Months Ended
 
September 30,
 
 
July 10,
 
September 30,
 
2013
 
 
2013
 
2012
 
(in millions)
Income tax benefit (expense) at the federal statutory rate
$
277

 
 
$
(155
)
 
$
1,013

Effect of:
 
 
 
 
 
 
State income taxes, net of federal income tax effect
35

 
 
(15
)
 
104

Change in valuation allowance
(327
)
 
 
(1,410
)
 
(1,210
)
Other, net
(15
)
 
 
(21
)
 
(17
)
Income tax expense
$
(30
)
 
 
$
(1,601
)
 
$
(110
)
Effective income tax rate
(3.8
)%
 
 
(361.4
)%
 
(3.8
)%