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Commitments And Contingent Liabilities Commitments And Contingent Liabilities (Tables) (Average Wholesale Price Litigation [Member])
 6 Months Ended
Sep. 30, 2012
Average Wholesale Price Litigation [Member]
  
Loss Contingencies [Line Items]  
Schedule of Litigation Reserve and Expense [Table Text Block]
The following is the activity related to the AWP litigation reserve for the first six months of 2013 and 2012:
 
Six Months Ended September 30,
(In millions)
2012
 
2011
AWP litigation reserve at beginning of period
$
453

 
$
330

Charges incurred
60

 
118

Payments made
(438
)
 
(6
)
AWP litigation reserve at end of period
$
75

 
$
442