Risk Management and Derivatives - Amounts Affecting Consolidated Statements of Income (Detail) - USD ($) $ in Millions		12 Months Ended
		May. 31, 2015	May. 31, 2014	May. 31, 2013
Foreign Exchange Contract [Member] | 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		$ 611	$ (75)	$ 51
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		(1)	(1)	(4)
Derivatives designated as cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	[1]	1,480	(143)	139
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	[1]	261	36	105
Derivatives designated as cash flow hedges | Foreign Exchange Contract [Member] | Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	[1]	(202)	(48)	42
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	[1]	(95)	14	(19)
Derivatives designated as cash flow hedges | Foreign Exchange Contract [Member] | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	[1]	1,109	(78)	67
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	[1]	220	12	113
Derivatives designated as cash flow hedges | Foreign Exchange Contract [Member] | Selling and administrative expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	[1]	0	4	(3)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	[1]	0	0	2
Derivatives designated as cash flow hedges | Foreign Exchange Contract [Member] | Other (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	[1]	497	(21)	33
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	[1]	136	10	9
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	[1]	76	0	0
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	[1]	0	0	0
Derivatives designated as net investment hedges | Foreign Exchange Contract [Member] | Other (income) expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	[1]	0	0	0
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	[1]	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	$ 5

[1] For the years ended May 31, 2015, 2014 and 2013, 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.