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Stockholders' Equity and Per Share Data (Tables)
 12 Months Ended
Mar. 31, 2015
Shareholders' Equity and Per Share Data [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive loss, net of tax are as follows:
 
March 31, 2015
 
March 31, 2014
 
(in millions)
Unrecognized net periodic pension and postretirement benefit cost
$
(388
)
 
$
(54
)
Unrealized net gains related to investments
1

 
7

Foreign currency translation adjustments
(21
)
 
4

Accumulated other comprehensive loss
$
(408
)
 
$
(43
)