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Receivables, Net (Tables)
12 Months Ended
Mar. 31, 2012
Receivables, Net [Abstract]  
Schedule Of Accounts Receivable
  March 31,
(In millions)   2012     2011  
Customer accounts $ 8,562   $ 7,982  
Other   1,537     1,341  
Total   10,099     9,323  
Allowances   (122 )   (136 )
Net $ 9,977   $ 9,187