Goodwill and Other Intangible Assets (Schedule of changes in the carrying amount of goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	May 30, 2021	May 31, 2020	May 26, 2019
Goodwill [Line Items]
Beginning balance	$ 13,923.2	$ 13,995.8	$ 14,065.0
Divestitures	(1.2)		(0.5)
Purchase accounting adjustment			5.6
Other activity, primarily foreign currency translation	140.4	(72.6)	(74.3)
Ending balance	14,062.4	13,923.2	13,995.8
North America Retail Segment [Member]
Goodwill [Line Items]
Beginning balance	6,403.7	6,406.5	6,410.6
Divestitures	0.0		0.0
Purchase accounting adjustment			0.0
Other activity, primarily foreign currency translation	15.6	(2.8)	(4.1)
Ending balance	6,419.3	6,403.7	6,406.5
Pet [Member]
Goodwill [Line Items]
Beginning balance	5,300.5	5,300.5	5,294.9
Divestitures	0.0		0.0
Purchase accounting adjustment			5.6
Other activity, primarily foreign currency translation	0.0	0.0	0.0
Ending balance	5,300.5	5,300.5	5,300.5
Convenience Stores and Foodservice [Member]
Goodwill [Line Items]
Beginning balance	918.8	918.8	918.8
Divestitures	0.0		0.0
Purchase accounting adjustment			0.0
Other activity, primarily foreign currency translation	0.0	0.0	0.0
Ending balance	918.8	918.8	918.8
Europe and Australia [Member]
Goodwill [Line Items]
Beginning balance	690.7	700.4	729.9
Divestitures	0.0		0.0
Purchase accounting adjustment			0.0
Other activity, primarily foreign currency translation	74.8	(9.7)	(29.5)
Ending balance	765.5	690.7	700.4
Asia and Latin America [Member]
Goodwill [Line Items]
Beginning balance	203.8	260.2	285.0
Divestitures	(1.2)		(0.5)
Purchase accounting adjustment			0.0
Other activity, primarily foreign currency translation	10.1	(56.4)	(24.3)
Ending balance	212.7	203.8	260.2
Joint Ventures [Member]
Goodwill [Line Items]
Beginning balance	405.7	409.4	425.8
Divestitures	0.0		0.0
Purchase accounting adjustment			0.0
Other activity, primarily foreign currency translation	39.9	(3.7)	(16.4)
Ending balance	$ 445.6	$ 405.7	$ 409.4