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Trade Accounts Receivable (Tables)
12 Months Ended
Mar. 31, 2017
Receivables [Abstract]  
Components of trade accounts receivable, net
The components of “Trade accounts receivable, net” were as follows:
 
At March 31,
(in millions)
2017
 
2016
Accounts receivable – billed
$
706

 
$
566

Accounts receivable – unbilled
55

 
55

Other receivables
14

 
13

Less: Allowances
(11
)
 
(9
)
Trade accounts receivable, net
$
764

 
$
625