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Computation of Earnings Per Share - Schedule of Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Aug. 31, 2019	Aug. 31, 2018
Basic earnings per common share:
Net earnings allocable to common shares	[1]	$ 744	$ 834
Weighted-average common shares		260.0	265.0
Basic earnings per common share		$ 2.86	$ 3.15
Diluted earnings per common share:
Net earnings allocable to common shares	[1]	$ 744	$ 834
Weighted-average common shares		260.0	265.0
Dilutive effect of share-based awards		2.0	4.0
Weighted-average diluted shares		262.0	269.0
Diluted earnings per common share		$ 2.84	$ 3.10
Anti-dilutive options excluded from diluted earnings per common share		10.9	3.7
[1] Net earnings available to participating securities were immaterial in all periods presented.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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