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Commitments And Contingent Liabilities (Tables) (Average Wholesale Price Litigation [Member])
 9 Months Ended
Dec. 31, 2012
Average Wholesale Price Litigation [Member]
  
Loss Contingencies [Line Items]  
Schedule of Litigation Reserve and Expense
 
Nine Months Ended December 31,
(In millions)
2012
 
2011
AWP litigation reserve at beginning of period
$
453

 
$
330

Charges incurred
60

 
145

Payments made
(470
)
 
(26
)
AWP litigation reserve at end of period
$
43

 
$
449