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Income Taxes (Tables)
 6 Months Ended
Sep. 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:
 
Six Months Ended
September 30,
 
2015
 
2014
 
(in millions)
Income tax benefit at the federal statutory rate
$
202

 
$
240

Effect of:
 
 
 
State income taxes, net of federal income tax effect
16

 
—

State law changes, net of federal income tax effect
25

 
—

Change in federal and state valuation allowance
(275
)
 
(297
)
Other, net
3

 
1

Income tax expense
$
(29
)
 
$
(56
)
Effective income tax rate
(5.0
)%
 
(8.2
)%