Earnings Per Share - Reconciliation from Basic to Diluted Earnings Per Share (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Determination of shares:
Weighted average common shares outstanding	1,623,500,000	1,653,100,000	1,629,900,000	1,661,500,000
Assumed conversion of dilutive stock options and awards	0	33,200,000	35,800,000	34,900,000
DILUTED WEIGHTED AVERAGE COMMON SHARES OUTSTANDING	1,623,500,000	1,686,300,000	1,665,700,000	1,696,400,000
(Loss) earnings per common share:
Basic (in dollars per share)	$ (0.57)	$ 0.69	$ 0.49	$ 1.95
Diluted (in dollars per share)	$ (0.57)	$ 0.68	$ 0.48	$ 1.91