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Stockholders' Equity and Per Share Data (Tables)
 12 Months Ended
Mar. 31, 2018
Shareholders' Equity and Per Share Data [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive loss, net of tax were as follows:
 
March 31,
 
2018
 
2017
 
(in millions)
Unrecognized net periodic pension and postretirement benefit cost
$
(337
)
 
$
(369
)
Unrealized net gains related to investments
8

 
—

Unrealized net gain (losses) on derivatives
32

 
(2
)
Foreign currency translation adjustments
(16
)
 
(33
)
Accumulated other comprehensive loss
$
(313
)
 
$
(404
)