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Income Taxes (Tables)
 9 Months Ended
Dec. 31, 2018
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 differ from the U.S. federal statutory rates for the nine-month periods ended December 31, 2018 and 2017, respectively, were as follows:
 
Nine Months Ended
December 31,
 
2018
 
2017
 
(in millions)
Income tax expense at the federal statutory rate
$
(61
)
 
$
(205
)
Effect of:
 
 
 
State income taxes, net of federal income tax effect
(40
)
 
(57
)
State law changes, net of federal income tax effect
62

 
(28
)
Increase deferred tax liability for organizational restructuring
(12
)
 
—

Increase deferred tax liability for business activity changes
—

 
(69
)
Credit for increasing research activities
13

 
11

Change in federal and state valuation allowance
12

 
(64
)
Increase in liability for unrecognized tax benefits
(6
)
 
(20
)
Tax benefit from the Tax Act
—

 
7,090

Non-deductible penalties
(29
)
 
—

Other, net
5

 
4

Income tax (expense) benefit
$
(56
)
 
$
6,662

Effective income tax rate
19.2
%
 
(1,021.8
)%