Earnings Per Share - Reconciliation from Basic to Diluted Earnings Per Share (Detail) - $ / shares shares in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Determination of shares:
Weighted average common shares outstanding	1,572.8	1,623.5	1,582.8	1,629.9
Assumed conversion of dilutive stock options and awards	36.8	0.0	38.7	35.8
DILUTED WEIGHTED AVERAGE COMMON SHARES OUTSTANDING	1,609.6	1,623.5	1,621.5	1,665.7
Earnings (loss) per common share:
Basic (in dollars per share)	$ 0.70	$ (0.57)	$ 1.92	$ 0.49
Diluted (in dollars per share)	$ 0.68	$ (0.57)	$ 1.87	$ 0.48