Goodwill and Other Intangible Assets (Schedule of changes in the carrying amount of goodwill) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Feb. 22, 2015
Goodwill [Line Items]
Beginning balance	$ 8,650.5
Acquisitions	589.8
Other activity, primarily foreign currency translation	(305.2)
Ending balance	8,935.1
U.S. Retail [Member]
Goodwill [Line Items]
Beginning balance	5,829.2
Acquisitions	589.8
Other activity, primarily foreign currency translation	0
Ending balance	6,419.0
International [Member]
Goodwill [Line Items]
Beginning balance	1,402.0
Acquisitions	0
Other activity, primarily foreign currency translation	(223.0)
Ending balance	1,179.0
Convenience Stores and Foodservice [Member]
Goodwill [Line Items]
Beginning balance	921.1
Acquisitions	0
Other activity, primarily foreign currency translation	0
Ending balance	921.1
Joint Ventures [Member]
Goodwill [Line Items]
Beginning balance	498.2
Acquisitions	0
Other activity, primarily foreign currency translation	(82.2)
Ending balance	$ 416.0