Retirement Benefits and Postemployment Benefits (Summarized Financial Information) (Details) - USD ($) $ in Millions	12 Months Ended
	May 28, 2023	May 29, 2022	May 30, 2021
Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	$ 6,510.3	$ 7,460.2
Actual return on assets	(413.5)	(618.7)
Employer contributions	30.0	31.2
Plan participant contributions	1.3	3.8
Benefits payments	(344.6)	(346.2)
Foreign currency	(4.9)	(20.0)
Fair value at end of year	5,778.6	6,510.3	$ 7,460.2
Defined Benefit Plan, Change in Projected Benefit Obligation Roll Forward [Abstract]
Benefit obligation at beginning of year	6,528.3	7,714.4
Service cost	70.3	93.5	104.4
Interest cost	258.5	184.3	192.1
Plan amendment	0.0	3.7
Curtailment/other	(8.5)	(29.4)
Plan participant contributions	1.3	3.8
Medicare Part D reimbursements	0.0	0.0
Actuarial (gain) loss	(538.1)	(1,089.7)
Benefits payments	(336.1)	(334.7)
Foreign currency	(5.0)	(17.6)
Projected benefit obligation at end of year	5,970.7	6,528.3	7,714.4
Plan assets (less) more than benefit obligation as of fiscal year end	(192.1)	(18.0)
Other Postretirement Benefit Plans Gross Payments [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	479.2	519.4
Actual return on assets	(6.6)	(18.0)
Employer contributions	0.1	0.1
Plan participant contributions	5.7	9.6
Benefits payments	(22.4)	(31.9)
Foreign currency	0.0	0.0
Fair value at end of year	456.0	479.2	519.4
Defined Benefit Plan, Change in Projected Benefit Obligation Roll Forward [Abstract]
Benefit obligation at beginning of year	469.6	600.0
Service cost	5.1	7.6	8.5
Interest cost	17.9	12.6	18.0
Plan amendment	0.0	(16.1)
Curtailment/other	0.0	(3.2)
Plan participant contributions	5.7	9.6
Medicare Part D reimbursements	0.7	1.7
Actuarial (gain) loss	(22.5)	(86.0)
Benefits payments	(45.5)	(56.9)
Foreign currency	(0.4)	0.3
Projected benefit obligation at end of year	430.6	469.6	600.0
Plan assets (less) more than benefit obligation as of fiscal year end	25.4	9.6
Postemployment Benefit Plans [Member]
Defined Benefit Plan, Change in Projected Benefit Obligation Roll Forward [Abstract]
Benefit obligation at beginning of year	138.5	151.7
Service cost	8.4	10.0	9.3
Interest cost	3.1	1.5	1.7
Plan amendment	0.0	0.0
Curtailment/other	10.4	12.0
Plan participant contributions	0.0	0.0
Medicare Part D reimbursements	0.0	0.0
Actuarial (gain) loss	(10.7)	(18.7)
Benefits payments	(18.5)	(17.7)
Foreign currency	(0.2)	(0.3)
Projected benefit obligation at end of year	131.0	138.5	$ 151.7
Plan assets (less) more than benefit obligation as of fiscal year end	$ (131.0)	$ 138.5