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Retirement and Postemployment Benefits (Tables)
6 Months Ended
Nov. 26, 2017
Retirement and Postemployment Benefits [Abstract]  
Schedule of components of net periodic benefit expense [Table Text Block]
Defined Benefit Pension PlansOther Postretirement Benefit PlansPostemployment Benefit Plans
Quarter EndedQuarter EndedQuarter Ended
In MillionsNov. 26, 2017Nov. 27, 2016Nov. 26, 2017Nov. 27, 2016Nov. 26, 2017Nov. 27, 2016
Service cost$25.7$30.0$2.9$3.1$2.2$2.2
Interest cost54.554.17.67.90.50.7
Expected return on plan assets(120.1)(121.7)(13.1)(12.1)--
Amortization of losses44.147.60.20.70.20.5
Amortization of prior service costs (credits)0.50.6(1.3)(1.3)0.10.1
Other adjustments-2.1-1.33.43.4
Settlement or curtailment losses -2.9-0.7--
Net expense (income)$4.7$15.6$(3.7)$0.3$6.4$6.9
Defined Benefit Pension PlansOther Postretirement Benefit PlansPostemployment Benefit Plans
Six-MonthPeriod EndedSix-MonthPeriod EndedSix-MonthPeriod Ended
In MillionsNov. 26, 2017Nov. 27, 2016Nov. 26, 2017Nov. 27, 2016Nov. 26, 2017Nov. 27, 2016
Service cost$51.4$60.0$5.8$6.2$4.3$4.4
Interest cost108.9108.315.216.01.11.4
Expected return on plan assets(240.0)(243.5)(26.1)(24.2)--
Amortization of losses88.295.00.41.30.40.9
Amortization of prior service costs (credits)1.01.2(2.7)(2.6)0.30.3
Other adjustments-2.1-1.36.86.8
Settlement or curtailment losses-4.4-0.7--
Net expense (income)$9.5$27.5$(7.4)$(1.3)$12.9$13.8