DuPont 2012 Annual Report Download - page 82

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

(Dollars in millions, except per share)
For determining U.S. pension plans' net periodic benefit costs, the discount rate, expected return on plan assets and the rate of compensation increase were
5.50 percent, 9.00 percent and 4.50 percent for 2011 and 6.00 percent, 9.00 percent and 4.50 percent for 2010, respectively.
In the U.S., the discount rate is developed by matching the expected cash flow of the benefit plans to a yield curve constructed from a portfolio of high quality
fixed-income instruments provided by the plan's actuary as of the measurement date. For non-U.S. benefit plans, the company utilizes prevailing long-term
high quality corporate bond indices to determine the discount rate applicable to each country at the measurement date.
The long-term rate of return on assets in the U.S. was selected from within the reasonable range of rates determined by historical real returns (net of inflation)
for the asset classes covered by the investment policy, expected performance, and projections of inflation over the long-term period during which benefits are
payable to plan participants. Consistent with prior years, the long-term rate of return on plan assets in the U.S. reflects the asset allocation of the plan and the
effect of the company's active management of the plans' assets. For non-U.S. plans, assumptions reflect economic assumptions applicable to each country.
  
Health care cost trend rate assumed for next year 8%8%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 5%5%
Year that the rate reaches the ultimate trend rate 2016 2015
Assumed health care cost trend rates have a modest effect on the amount reported for the health care plan. A one-percentage point change in assumed health care
cost trend rates would have the following effects:




Increase (decrease) on total of service and interest cost $ 5 $ (5)
Increase (decrease) on post-retirement benefit obligation 75 (86)
F-34