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Receivables, Net (Tables)
12 Months Ended
Mar. 31, 2016
Receivables, Net, Current [Abstract]  
Schedule of receivables
 
March 31,
(In millions)
2016
 
2015
Customer accounts
$
14,519

 
$
13,117

Other
3,711

 
2,965

Total
18,230

 
16,082

Allowances
(250
)
 
(168
)
Net
$
17,980

 
$
15,914