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Income Taxes (Tables)
 3 Months Ended
Jun. 30, 2015
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:
 
Three Months Ended
June 30,
 
2015
 
2014
 
(in millions)
Income tax benefit (expense) at the federal statutory rate
$
13

 
$
(3
)
Effect of:
 
 
 
State income taxes, net of federal income tax effect
(1
)
 
(7
)
State law changes, net of federal income tax effect
21

 
—

Change in federal and state valuation allowance
(22
)
 
27

Other, net
6

 
(2
)
Income tax benefit
$
17

 
$
15

Effective income tax rate
45.9
%
 
(187.5
)%