Risk Management and Derivatives - Amounts Affecting Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive gains (losses) before reclassifications, net of tax	$ (44)	$ (223)
Reclassifications to net income of previously deferred (gains) losses, net of tax	(189)	(190)
Derivatives designated as cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	(106)	(140)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	180	188
Derivatives designated as cash flow hedges | Foreign exchange forwards and options | Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	53	29
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	33	(46)
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	(52)	(104)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	104	173
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	(16)	(65)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	43	61
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	(91)	0
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	0	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	1
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	(35)	(29)
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	(3)	0
Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive gains (losses) before reclassifications, net of tax	(60)	(142)
Reclassifications to net income of previously deferred (gains) losses, net of tax	$ (180)	(187)
Cash Flow Hedges | Revisions
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive gains (losses) before reclassifications, net of tax		40
Reclassifications to net income of previously deferred (gains) losses, net of tax		$ (40)