| http://www.w3.org/ns/prov#value | - The weighted average discount rate we used to measure our retiree health obligation as of December 31, 2011 and to calculate our 2012 expense was 4.5%, which is lower than the 4.9% that was used to calculate our 2011 expense.The following is a summary of our benefit plan costs and funding for the three years ended December 31, 2011 as well as estimated amounts for 2012: Estimated ActualBenefit Pla
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