Retirement Benefits and Postemployment Benefits (Schedule of assumptions used to determine benefit obligations) (Details)	May 30, 2021	May 31, 2020
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract]
Discount rate	3.17%	3.20%
Rate of salary increases	4.39%	4.44%
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract]
Discount rate	3.03%	3.02%
Rate of salary increases	0.00%	0.00%
Postemployment Benefit Plans [Member]
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract]
Discount rate	2.04%	1.85%
Rate of salary increases	4.46%	4.51%