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Commitments and Contingent Liabilities (Tables) (Average Wholesale Price Litigation [Member])
3 Months Ended
Jun. 30, 2013
Average Wholesale Price Litigation [Member]
 
Loss Contingencies [Line Items]  
Litigation Reserve and Expense
 
Quarter Ended June 30,
(In millions)
2013
 
2012
AWP litigation reserve at beginning of period
$
42

 
$
453

Charges incurred
15

 
16

Payments made
(20
)
 
(273
)
AWP litigation reserve at end of period
$
37

 
$
196