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Employee Benefits - Weighted Average Health Care Cost Trend Rate Assumptions (Detail)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Health care cost trend rate for next year 7.90% 8.10%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 4.50% 4.50%
Year that the rate reaches the ultimate trend rate 2028 2028