Risk Management and Derivatives - Amounts Affecting Consolidated Statements of Income (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Foreign Exchange Contract | Other (income) expense, net | Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ (57)	$ (44)	$ (68)
Embedded derivatives | Other (income) expense, net | Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(4)	(2)	(2)
Derivatives designated as cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	(49)	94	(75)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(131)	630	717
Derivatives designated as cash flow hedges | Foreign Exchange Contract | Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	19	72	90
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	34	96	(88)
Derivatives designated as cash flow hedges | Foreign Exchange Contract | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	(50)	43	(57)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(90)	339	586
Derivatives designated as cash flow hedges | Foreign Exchange Contract | Selling and administrative expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	1	(4)	0
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	1	0	0
Derivatives designated as cash flow hedges | Foreign Exchange Contract | Other (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	(19)	37	(25)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(69)	199	219
Derivatives designated as cash flow hedges | Interest rate swaps | Interest (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	0	(54)	(83)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(7)	(4)	0
Derivatives designated as fair value hedges | Interest rate swaps | Interest (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 0	$ 0	$ 2