Risk Management and Derivatives - Amounts Affecting Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2017	Aug. 31, 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	$ (194)	$ (35)
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	(1)	3
Derivatives designated as cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	(350)	(106)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	47	180
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	55	53
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	2	33
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	(277)	(52)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	45	104
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	1	0
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 expense (income), net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	(129)	(16)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	2	43
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	(91)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	$ (2)	$ 0