Risk Management and Derivatives - Amounts Affecting Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Other (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 74	$ 25	$ 188	$ (169)
Derivatives not designated as hedging instruments | Embedded derivatives | Other (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	6	(3)	4	(4)
Derivatives designated as cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	255	(16)	398	(366)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	12	(30)	(38)	17
Derivatives designated as cash flow hedges | Foreign exchange forwards and options | Revenues
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	3	(36)	19	19
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	3	13	8	15
Derivatives designated as cash flow hedges | Foreign exchange forwards and options | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	173	13	274	(264)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	10	(21)	(34)	24
Derivatives designated as cash flow hedges | Foreign exchange forwards and options | Demand creation expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives			0	1
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income			0	0
Derivatives designated as cash flow hedges | Foreign exchange forwards and options | Other (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	79	7	105	(122)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	0	(20)	(9)	(18)
Derivatives designated as cash flow hedges | Interest rate swaps | Interest expense (income), 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)	$ (2)	$ (3)	$ (4)