Risk Management and Derivatives - FV of Derivative Instruments Included within Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	May 31, 2016	May 31, 2015
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 617	$ 1,639
Liability Derivatives	199	175
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	544	1,423
Liability Derivatives	95	144
Designated as Hedging Instrument | Foreign Exchange Contract | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	447	825
Designated as Hedging Instrument | Foreign Exchange Contract | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	90	520
Designated as Hedging Instrument | Foreign Exchange Contract | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	38	140
Designated as Hedging Instrument | Foreign Exchange Contract | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	12	4
Designated as Hedging Instrument | Interest rate swaps | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	7	78
Designated as Hedging Instrument | Interest rate swaps | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Designated as Hedging Instrument | Interest rate swaps | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	45	0
Designated as Hedging Instrument | Interest rate swaps | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	0
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	73	216
Liability Derivatives	104	31
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	40	209
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	26	0
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	76	20
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	19	0
Derivatives not designated as hedging instruments | Embedded derivatives | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	2	2
Derivatives not designated as hedging instruments | Embedded derivatives | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	5	5
Derivatives not designated as hedging instruments | Embedded derivatives | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	2	2
Derivatives not designated as hedging instruments | Embedded derivatives | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 7	$ 9