Risk Management and Derivatives - Amounts Affecting Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 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	$ (101)	$ (66)	$ (270)	$ 101
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	1	(1)	(3)	(2)
Derivatives designated as cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	(158)	1	(524)	383
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(48)	176	(31)	495
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	7	5	26	45
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	9	24	24	96
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	(118)	(5)	(382)	244
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(41)	87	(17)	260
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	(3)	1	(1)
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 (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	(47)	4	(169)	149
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(15)	67	(33)	141
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	(54)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	$ (1)	$ (2)	$ (5)	$ (2)