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Note 21: Other Postretirement Benefits (Detail) - Weighted-average Assumptions Used to Determine the Net Benefit Obligations (Other Postretirement Benefit Plans [Member])
Dec. 31, 2012
Dec. 31, 2011
Other Postretirement Benefit Plans [Member]
   
Discount rate 2.97% 4.25%
Salary increase rate 2.50% 3.41%