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Income Taxes (Tables)
 3 Months Ended
Jun. 30, 2016
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,
 
2016
 
2015
 
(in millions)
Income tax benefit at the federal statutory rate
$
86

 
$
13

Effect of:
 
 
 
State income taxes, net of federal income tax effect
3

 
(1
)
State law changes, net of federal income tax effect
—

 
21

Change in federal and state valuation allowance
(142
)
 
(22
)
Other, net
(3
)
 
6

Income tax (expense) benefit
$
(56
)
 
$
17

Effective income tax rate
(22.8
)%
 
45.9
%