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Receivables, Net (Tables)
 12 Months Ended
Mar. 31, 2013
Receivables, Net, Current [Abstract]  
Schedule of Accounts Receivable
 
March 31,
(In millions)
2013
 
2012
Customer accounts
$
8,683

 
$
8,562

Other
1,423

 
1,537

Total
10,106

 
10,099

Allowances
(131
)
 
(122
)
Net
$
9,975

 
$
9,977