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Note 21: Other Postretirement Benefits (Detail) - Weighted-Average Assumption Used to Determine Net Post Retirement Benefit Cost
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Discount rate 4.25% 5.03% 5.53%
Salary increase rate 3.09% 4.05% 3.90%