Retirement Benefits and Postemployment Benefits (Summarized Financial Information) (Details) - USD ($) $ in Millions	12 Months Ended
	May 26, 2024	May 28, 2023	May 29, 2022
Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	$ 5,778.6	$ 6,510.3
Actual return on assets	(23.2)	(413.5)
Employer contributions	30.0	30.0
Plan participant contributions	2.0	1.3
Benefits payments	(349.5)	(344.6)
Foreign currency	1.8	(4.9)
Fair value at end of year	5,439.7	5,778.6	$ 6,510.3
Defined Benefit Plan, Change in Projected Benefit Obligation Roll Forward [Abstract]
Benefit obligation at beginning of year	5,970.7	6,528.3
Service cost	56.8	70.3	93.5
Interest cost	296.5	258.5	184.3
Plan amendment	1.2	0.0
Curtailment/other	(13.9)	(8.5)
Plan participant contributions	2.0	1.3
Medicare Part D reimbursements	0.0	0.0
Actuarial gain	(174.4)	(538.1)
Benefits payments	(339.1)	(336.1)
Foreign currency	1.9	(5.0)
Projected benefit obligation at end of year	5,801.7	5,970.7	6,528.3
Plan assets (less) more than benefit obligation as of fiscal year end	(362.0)	(192.1)
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets Roll Forward [Abstract]
Fair value at beginning of year	456.0	479.2
Actual return on assets	45.6	(6.6)
Employer contributions	0.1	0.1
Plan participant contributions	6.4	5.7
Benefits payments	(44.9)	(22.4)
Foreign currency	0.0	0.0
Fair value at end of year	463.2	456.0	479.2
Defined Benefit Plan, Change in Projected Benefit Obligation Roll Forward [Abstract]
Benefit obligation at beginning of year	430.6	469.6
Service cost	4.7	5.1	7.6
Interest cost	21.3	17.9	12.6
Plan amendment	0.0	0.0
Curtailment/other	0.0	0.0
Plan participant contributions	6.4	5.7
Medicare Part D reimbursements	0.0	0.7
Actuarial gain	(14.1)	(22.5)
Benefits payments	(45.7)	(45.5)
Foreign currency	(0.2)	(0.4)
Projected benefit obligation at end of year	403.0	430.6	469.6
Plan assets (less) more than benefit obligation as of fiscal year end	60.2	25.4
Postemployment Benefit Plans [Member]
Defined Benefit Plan, Change in Projected Benefit Obligation Roll Forward [Abstract]
Benefit obligation at beginning of year	131.0	138.5
Service cost	7.4	8.4	10.0
Interest cost	4.0	3.1	1.5
Plan amendment	(9.6)	0.0
Curtailment/other	10.2	10.4
Plan participant contributions	0.0	0.0
Medicare Part D reimbursements	0.0	0.0
Actuarial gain	10.3	(10.7)
Benefits payments	(24.3)	(18.5)
Foreign currency	0.0	(0.2)
Projected benefit obligation at end of year	129.0	131.0	$ 138.5
Plan assets (less) more than benefit obligation as of fiscal year end	$ (129.0)	$ 131.0