Business Segment Information (Schedule of operating segment results) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May 28, 2017	Feb. 26, 2017	Nov. 27, 2016	Aug. 28, 2016	May 29, 2016	Feb. 28, 2016	Nov. 29, 2015	Aug. 30, 2015	May 28, 2017	May 29, 2016	May 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 3,806.6	$ 3,793.2	$ 4,112.1	$ 3,907.9	$ 3,927.9	$ 4,002.4	$ 4,424.9	$ 4,207.9	$ 15,619.8	$ 16,563.1	$ 17,630.3
Operating profit									2,566.4	2,707.4	2,077.3
Divestitures loss (gain)									13.5	(148.2)	0.0
Restructuring, impairment, and other exit costs									182.6	151.4	543.9
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									15,619.8	16,563.1	17,630.3
Operating profit									2,952.6	2,999.5	3,035.0
Unallocated Corporate Items [Member]
Segment Reporting Information [Line Items]
Operating profit									190.1	288.9	413.8
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Divestitures loss (gain)									13.5	(148.2)	0.0
Restructuring, impairment, and other exit costs									182.6	151.4	543.9
North America Retail [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									10,196.9	10,936.6	11,612.1
Operating profit									2,303.6	2,351.2	2,382.7
Convenience Stores and Foodservice Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									1,870.0	1,923.8	1,995.1
Operating profit									401.2	378.9	353.1
Europe and Australia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									1,824.5	1,998.0	2,126.5
Operating profit									164.2	200.3	179.4
Asia and Latin America [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									1,728.4	1,704.7	1,896.6
Operating profit									$ 83.6	$ 69.1	$ 119.8