Trade Accounts Receivable (Tables)
 9 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Components of trade accounts receivable, net
The components of “Trade accounts receivable, net” were as follows:
 
December 31,
2014
 
March 31,
2014
 
(in millions)
Accounts receivable – billed
$
614

 
$
739

Accounts receivable – unbilled
64

 
61

Other receivables
8

 
19

Less: Allowances
(17
)
 
(19
)
Trade accounts receivable, net
$
669

 
$
800