Risk Management and Derivatives - Amounts Affecting Consolidated Statements of Income (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
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	$ (68)	$ 611	$ (75)
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	(2)	(1)	(1)
Derivatives designated as cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	(75)	1,480	(143)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	717	261	36
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	90	(202)	(48)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(88)	(95)	14
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	(57)	1,109	(78)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	586	220	12
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	0	0	4
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	0	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	(25)	497	(21)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	219	136	10
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	(83)	76	0
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	0	0	0
Derivatives designated as net investment 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	0	0	0
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	0	0	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	$ 2	$ 5	$ 5