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Business Segment Information (Operating Segment Results) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May 28, 2023	Feb. 26, 2023	Nov. 27, 2022	Aug. 28, 2022	May 29, 2022	Feb. 27, 2022	Nov. 28, 2021	Aug. 29, 2021	May 28, 2023	May 29, 2022	May 30, 2021
Segment Reporting Information [Line Items]
Net sales	$ 5,030.0	$ 5,125.9	$ 5,220.7	$ 4,717.6	$ 4,891.2	$ 4,537.7	$ 5,024.0	$ 4,539.9	$ 20,094.2	$ 18,992.8	$ 18,127.0
Divestitures (gain) loss, net									(444.6)	(194.1)	53.5
Restructuring, impairment, and other exit costs (recoveries)									56.2	(26.5)	170.4
Operating profit									3,433.8	3,475.8	3,144.8
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									20,094.2	18,992.8	18,127.0
Operating profit									4,078.6	3,657.8	3,580.8
Unallocated Corporate Items [Member]
Segment Reporting Information [Line Items]
Operating profit									1,033.2	402.6	212.1
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Divestitures (gain) loss, net									(444.6)	(194.1)	53.5
Restructuring, impairment, and other exit costs (recoveries)									56.2	(26.5)	170.4
North America Retail Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									12,659.9	11,572.0	11,250.0
Operating profit									3,181.3	2,699.7	2,725.9
U.S. Meals & Baking Solutions [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									4,426.3	4,023.8	4,042.2
U.S. Morning Foods [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									3,620.1	3,370.9	3,314.0
U.S. Snacks [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									3,611.0	3,191.4	2,940.5
Canada [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									1,002.5	985.9	953.3
International [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									2,769.5	3,315.7	3,656.8
Operating profit									161.8	232.0	236.6
North America Foodservice [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									2,191.5	1,845.7	1,487.8
Operating profit									290.0	255.5	203.3
Pet Segment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									2,473.3	2,259.4	1,732.4
Operating profit									$ 445.5	$ 470.6	$ 415.0