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Receivables, Net (Tables)
 12 Months Ended
Mar. 31, 2015
Receivables, Net, Current [Abstract]  
Schedule of Accounts Receivable
 
March 31,
(In millions)
2015
 
2014
Customer accounts
$
13,117

 
$
12,169

Other
2,965

 
1,740

Total
16,082

 
13,909

Allowances
(168
)
 
(129
)
Net
$
15,914

 
$
13,780