Risk Management and Derivatives - Amounts Affecting Consolidated Statements of Income (Detail) - USD ($) $ in Millions		3 Months Ended
		Aug. 31, 2015	Aug. 31, 2014
Derivatives designated as cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	[1]	$ (180)	$ 118
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	[1]	148	(20)
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	[1]	33	(38)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	[1]	(43)	(17)
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	[1]	(118)	119
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	[1]	160	(8)
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	[1]	(95)	37
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	[1]	31	5
Derivatives designated as cash flow hedges | Interest rate swap | Interest expense (income), net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	[1]	0	0
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	[1]	0	0
Fair Value Hedging | Interest rate swap | Interest expense (income), net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	[2]	1	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		(29)	93
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		$ 0	$ (1)

[1] For the three months ended August 31, 2015, the amounts recorded in Other (income) expense, net as a result of hedge ineffectiveness and the discontinuance of cash flow hedges because the forecasted transactions were no longer probable of occurring were immaterial.

[2] All interest rate swaps designated as fair value hedges meet the shortcut method requirements under the accounting standards for derivatives and hedging. Accordingly, changes in the fair values of the interest rate swaps are considered to exactly offset changes in the fair value of the underlying long-term debt. Refer to “Fair Value Hedges” in this note for additional detail.