Retirement Benefits and Postemployment Benefits (Components Of Net Periodic Benefit Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	May 28, 2023	May 29, 2022	May 30, 2021
Defined Benefit Pension Plans [Member]
Components of Net Periodic Benefit Cost [Abstract]
Service cost	$ 70.3	$ 93.5	$ 104.4
Interest cost	258.5	184.3	192.1
Expected return on plan assets	(420.5)	(411.1)	(420.9)
Amortization of losses (gains)	113.2	140.5	108.3
Amortization of prior service costs (credits)	1.5	1.0	1.3
Other adjustments	0.0	0.1	0.0
Settlement or curtailment (gains) losses	(0.7)	(18.4)	14.9
Net expense (income)	22.3	(10.1)	0.1
Other Postretirement Benefit Plans Gross Payments [Member]
Components of Net Periodic Benefit Cost [Abstract]
Service cost	5.1	7.6	8.5
Interest cost	17.9	12.6	18.0
Expected return on plan assets	(31.1)	(26.7)	(34.7)
Amortization of losses (gains)	(19.3)	(10.9)	(5.1)
Amortization of prior service costs (credits)	(23.2)	(20.9)	(5.5)
Other adjustments	0.0	(0.1)	0.0
Settlement or curtailment (gains) losses	0.0	(5.5)	0.0
Net expense (income)	(50.6)	(43.9)	(18.8)
Postemployment Benefit Plans [Member]
Components of Net Periodic Benefit Cost [Abstract]
Service cost	8.4	10.0	9.3
Interest cost	3.1	1.5	1.7
Expected return on plan assets	0.0	0.0	0.0
Amortization of losses (gains)	0.4	3.0	2.6
Amortization of prior service costs (credits)	0.3	0.4	0.9
Other adjustments	10.4	12.9	8.4
Settlement or curtailment (gains) losses	0.0	0.0	0.0
Net expense (income)	$ 22.6	$ 27.8	$ 22.9