Income Taxes (Schedule of earnings before income taxes and after-tax earnings from joint ventures and corresponding income taxes) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	May 26, 2019	May 31, 2020	May 26, 2019	May 27, 2018
Earnings before income taxes and after-tax earnings from joint ventures:
United States		$ 2,402.1	$ 1,788.2	$ 1,884.0
Foreign		198.1	293.8	251.6
Earnings before income taxes and after-tax earnings from joint ventures		2,600.2	2,082.0	2,135.6
Income taxes currently payable:
Federal		381.0	151.9	441.2
State and local		55.3	35.3	35.2
Foreign		73.8	84.6	85.2
Total current		510.1	271.8	561.6
Income taxes deferred:
Federal		67.8	86.7	(478.5)
State and local		(56.6)	21.6	15.7
Foreign		(40.8)	(12.3)	(41.5)
Total deferred		(29.6)	96.0	(504.3)
Total income taxes	$ (72.9)	$ 480.5	$ 367.8	$ 57.3