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Trade Accounts Receivable (Tables)
 6 Months Ended
Sep. 30, 2016
Receivables [Abstract]  
Components of trade accounts receivable, net
The components of “Trade accounts receivable, net” were as follows:
 
September 30,
2016
 
March 31,
2016
 
(in millions)
Accounts receivable – billed
$
385

 
$
566

Accounts receivable – unbilled
60

 
55

Other receivables
10

 
13

Less: Allowances
(10
)
 
(9
)
Trade accounts receivable, net
$
445

 
$
625