Goodwill and Other Intangible Assets (Schedule of changes in the carrying amount of goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	May 26, 2019	May 27, 2018	May 28, 2017
Goodwill [Line Items]
Beginning balance	$ 14,065.0	$ 8,747.2	$ 8,741.2
Acquisitions		5,294.9	0.0
Divestitures	(0.5)	0.0	(2.3)
Purchase accounting adjustment	5.6
Other activity, primarily foreign currency translation	(74.3)	22.9	8.3
Ending balance	13,995.8	14,065.0	8,747.2
North America Retail [Member]
Goodwill [Line Items]
Beginning balance	6,410.6	6,406.5	6,410.3
Acquisitions	0.0	0.0	0.0
Divestitures		0.0	0.0
Other activity, primarily foreign currency translation	(4.1)	4.1	(3.8)
Ending balance	6,406.5	6,410.6	6,406.5
Pet [Member]
Goodwill [Line Items]
Acquisitions	5,294.9	5,294.9
Divestitures			0.0
Purchase accounting adjustment	5.6
Ending balance	5,300.5
Convenience Stores and Foodservice [Member]
Goodwill [Line Items]
Beginning balance	918.8	918.8	921.1
Acquisitions	0.0	0.0	0.0
Divestitures		0.0	(2.3)
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	729.9	700.8	716.5
Acquisitions	0.0	0.0	0.0
Divestitures		0.0	0.0
Other activity, primarily foreign currency translation	(29.5)	29.1	(15.7)
Ending balance	700.4	729.9	700.8
Asia and Latin America [Member]
Goodwill [Line Items]
Beginning balance	285.0	312.4	287.1
Acquisitions		0.0	0.0
Divestitures	(0.5)	0.0	0.0
Other activity, primarily foreign currency translation	(24.3)	(27.4)	25.3
Ending balance	260.2	285.0	312.4
Joint Ventures [Member]
Goodwill [Line Items]
Beginning balance	425.8	408.7	406.2
Acquisitions	0.0	0.0	0.0
Divestitures		0.0	0.0
Other activity, primarily foreign currency translation	(16.4)	17.1	2.5
Ending balance	$ 409.4	$ 425.8	$ 408.7