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Receivables, Net (Tables)
 12 Months Ended
Mar. 31, 2014
Receivables, Net, Current [Abstract]  
Schedule of Accounts Receivable
 
March 31,
(In millions)
2014
 
2013
Customer accounts
$
12,543

 
$
8,683

Other
1,780

 
1,423

Total
14,323

 
10,106

Allowances
(130
)
 
(131
)
Net
$
14,193

 
$
9,975