Goodwill and Other Intangibles (Schedule of changes in the carrying amount of goodwill) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 26, 2013	May 27, 2012	May 29, 2011
Goodwill [Line Items]
Beginning balance	$ 8,182.5	$ 6,750.8	$ 6,592.8
Acquisitions	407.0	1,616.7	71.5
Divestitures			(2.4)
Other activity, primarily foreign currency translation	32.7	(185.0)	88.9
Ending balance	8,622.2	8,182.5	6,750.8
U.S. Retail [Member]
Goodwill [Line Items]
Beginning balance	5,813.2	5,142.9	5,098.3
Acquisitions	28.2	670.3	44.6
Divestitures			0
Other activity, primarily foreign currency translation	0	0	0
Ending balance	5,841.4	5,813.2	5,142.9
International [Member]
Goodwill [Line Items]
Beginning balance	989.9	162.6	122.0
Acquisitions	378.8	946.4	26.9
Divestitures			(0.5)
Other activity, primarily foreign currency translation	18.3	(119.1)	14.2
Ending balance	1,387.0	989.9	162.6
Bakeries And Foodservice [Member]
Goodwill [Line Items]
Beginning balance	921.1	921.1	923.0
Acquisitions	0	0	0
Divestitures			(1.9)
Other activity, primarily foreign currency translation	0	0	0
Ending balance	921.1	921.1	921.1
Joint Ventures [Member]
Goodwill [Line Items]
Beginning balance	458.3	524.2	449.5
Acquisitions	0	0	0
Divestitures			0
Other activity, primarily foreign currency translation	14.4	(65.9)	74.7
Ending balance	$ 472.7	$ 458.3	$ 524.2