Risk Management and Derivatives - Amounts Affecting Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
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	$ (66)	$ (30)	$ 101	$ 4
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)	(3)	(2)	(3)
Derivatives designated as cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	1	(175)	383	92
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	176	202	495	525
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	5	107	45	97
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	24	(24)	96	(99)
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	(5)	(142)	244	63
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	87	153	260	451
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	(3)	0	(1)	0
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	4	(91)	149	31
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	67	73	141	173
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	(49)	(54)	(99)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(2)	0	(2)	0
Derivatives designated as fair value hedges | Interest rate swaps | Interest expense (income), net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 0	$ 0	$ 0	$ 2