Risk Management and Derivatives - Amounts Affecting Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Foreign Exchange Contract | Other (income) expense, net | Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF GAIN (LOSS) RECOGNIZED IN INCOME ON DERIVATIVES	$ (21)	$ 74	$ (21)	$ 188
Embedded derivatives | Other (income) expense, net | Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF GAIN (LOSS) RECOGNIZED IN INCOME ON DERIVATIVES	(4)	6	(5)	4
Derivatives designated as cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	(19)	255	144	398
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	130	12	257	(38)
Derivatives designated as cash flow hedges | Foreign Exchange Contract | Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	(83)	3	(62)	19
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	1	3	9	8
Derivatives designated as cash flow hedges | Foreign Exchange Contract | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	37	173	146	274
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	102	10	177	(34)
Derivatives designated as cash flow hedges | Foreign Exchange Contract | Demand creation expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	0	0	0	0
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(3)	0	(3)	0
Derivatives designated as cash flow hedges | Foreign Exchange Contract | Other (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	27	79	60	105
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	31	0	77	(9)
Derivatives designated as cash flow hedges | Interest rate swaps | Interest (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	0	0	0	0
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	$ (1)	$ (1)	$ (3)	$ (3)