Business Segment Information (Schedule of operating segment results) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May 27, 2018	Feb. 25, 2018	Nov. 26, 2017	Aug. 27, 2017	May 28, 2017	Feb. 26, 2017	Nov. 27, 2016	Aug. 28, 2016	May 27, 2018	May 28, 2017	May 29, 2016
Segment Reporting Information [Line Items]
Net sales	$ 3,890.2	$ 3,882.3	$ 4,198.7	$ 3,769.2	$ 3,806.6	$ 3,793.2	$ 4,112.1	$ 3,907.9	$ 15,740.4	$ 15,619.8	$ 16,563.1
Operating profit									2,509.3	2,566.4	2,707.4
Divestitures loss (gain)									0.0	13.5	(148.2)
Restructuring, impairment, and other exit costs									165.6	182.6	151.4
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									15,740.4	15,619.8	16,563.1
Operating profit									2,791.7	2,952.6	2,999.5
Unallocated Corporate Items [Member]
Segment Reporting Information [Line Items]
Operating profit									116.8	190.1	288.9
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Divestitures loss (gain)									0.0	13.5	(148.2)
Restructuring, impairment, and other exit costs									165.6	182.6	151.4
North America Retail [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									10,115.4	10,196.9	10,936.6
Operating profit									2,217.4	2,303.6	2,351.2
Convenience Stores and Foodservice [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									1,930.2	1,870.0	1,923.8
Operating profit									392.6	401.2	378.9
Europe and Australia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									1,984.6	1,824.5	1,998.0
Operating profit									142.1	164.2	200.3
Asia and Latin America [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									1,710.2	1,728.4	1,704.7
Operating profit									$ 39.6	$ 83.6	$ 69.1