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RETIREMENT AND POSTEMPLOYMENT BENEFITS
9 Months Ended
Feb. 25, 2018
Retirement and Postemployment Benefits [Abstract]  
Retirement and Postemployment Benefits

(14) Retirement and Postemployment Benefits

In fiscal 2017, we changed the method used to estimate the service and interest cost components of the net periodic benefit expense for our United States and most of our international defined benefit pension, other postretirement benefit, and postemployment benefit plans. We adopted a full yield curve approach to estimate service cost and interest cost by applying the specific spot rates along the yield curve used to determine the benefit obligation to the relevant projected cash flows. This method provides a more precise measurement of service and interest costs by correlating the timing of the plans’ liability cash flows to the corresponding rate on the yield curve.

Components of net periodic benefit expense are as follows:

Defined Benefit Pension PlansOther Postretirement Benefit PlansPostemployment Benefit Plans
Quarter EndedQuarter EndedQuarter Ended
In MillionsFeb. 25, 2018Feb. 26, 2017Feb. 25, 2018Feb. 26, 2017Feb. 25, 2018Feb. 26, 2017
Service cost$25.7$29.9$2.9$3.2$2.1$2.2
Interest cost54.554.17.68.20.60.7
Expected return on plan assets(120.1)(121.6)(13.0)(12.1)--
Amortization of losses44.647.20.20.60.20.4
Amortization of prior service costs (credits)0.40.6(1.3)(1.5)0.20.2
Other adjustments----0.43.4
Net expense (income)$5.1$10.2$(3.6)$(1.6)$3.5$6.9
Defined Benefit Pension PlansOther Postretirement Benefit PlansPostemployment Benefit Plans
Nine-MonthPeriod EndedNine-MonthPeriod EndedNine-MonthPeriod Ended
In MillionsFeb. 25, 2018Feb. 26, 2017Feb. 25, 2018Feb. 26, 2017Feb. 25, 2018Feb. 26, 2017
Service cost$77.1$89.9$8.7$9.4$6.4$6.6
Interest cost163.4162.422.824.21.72.1
Expected return on plan assets(360.1)(365.1)(39.1)(36.3)--
Amortization of losses132.8142.20.61.90.61.3
Amortization of prior service costs (credits)1.41.8(4.0)(4.1)0.50.5
Other adjustments-2.1-1.37.210.2
Settlement or curtailment losses-4.4-0.7--
Net expense (income)$14.6$37.7$(11.0)$(2.9)$16.4$20.7