Risk Management and Derivatives - Amounts Affecting Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Other expense (income), net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 25	$ 202	$ (169)	$ 167
Derivatives not designated as hedging instruments | Embedded derivatives | Other expense (income), net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(3)	2	(4)	(1)
Derivatives designated as cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	(16)	488	(366)	382
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(30)	139	17	319
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	(36)	(13)	19	40
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	13	39	15	72
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	13	302	(264)	250
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(21)	69	24	173
Derivatives designated as cash flow hedges | Foreign exchange forwards and options | Total selling and administrative expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	0	2	1	2
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	0	0	0	0
Derivatives designated as cash flow hedges | Foreign exchange forwards and options | Other expense (income), net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	7	160	(122)	144
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(20)	31	(18)	74
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	37	0	(54)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	$ (2)	$ 0	$ (4)	$ 0