Risk Management and Derivatives - FV of Derivative Instruments Included within Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	May 31, 2017	May 31, 2016
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 241	$ 617
Liability Derivatives	254	199
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	126	544
Liability Derivatives	132	95
Designated as Hedging Instrument | Foreign Exchange Contract | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	113	447
Designated as Hedging Instrument | Foreign Exchange Contract | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	13	90
Designated as Hedging Instrument | Foreign Exchange Contract | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	59	38
Designated as Hedging Instrument | Foreign Exchange Contract | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	73	12
Designated as Hedging Instrument | Interest rate swaps | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	7
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	0	45
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	115	73
Liability Derivatives	122	104
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	103	40
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	2	26
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	107	76
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	7	19
Derivatives not designated as hedging instruments | Embedded derivatives | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	1	2
Derivatives not designated as hedging instruments | Embedded derivatives | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	9	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	$ 6	$ 7