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Income Taxes (Tables)
 6 Months Ended
Sep. 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
 
Six Months Ended
September 30,
 
 
101 Days Ended
July 10,
 
2014
 
2013
 
 
2013
 
(in millions)
Income tax benefit (expense) at the federal statutory rate
$
240

 
$
274

 
 
$
(367
)
Effect of:
 
 
 
 
 
 
State income taxes, net of federal income tax effect
—

 
35

 
 
(31
)
Change in federal and state valuation allowance
(297
)
 
(327
)
 
 
(1,145
)
Other, net
1

 
(11
)
 
 
(20
)
Income tax expense
$
(56
)
 
$
(29
)
 
 
$
(1,563
)
Effective income tax rate
(8.2
)%
 
(3.7
)%
 
 
149.1
%