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Income Taxes (Tables)
 3 Months Ended
Jun. 30, 2014
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
 
Three Months Ended
June 30,
 
 
Three Months Ended
June 30,
 
2014
 
2013
 
 
2013
 
(in millions)
Income tax (expense) benefit at the federal statutory rate
$
(3
)
 
$
61

 
 
$
539

Effect of:
 
 
 
 
 
 
State income taxes, net of federal income tax effect
(7
)
 
7

 
 
47

Change in valuation allowance
27

 
—

 
 
(621
)
Acquisition-related costs
—

 
(7
)
 
 
(8
)
Other, net
(2
)
 
—

 
 
(12
)
Income tax benefit (expense)
$
15

 
$
61

 
 
$
(55
)
Effective income tax rate
(187.5
)%
 
35.0
%
 
 
(3.6
)%