Risk Management and Derivatives - FV of Derivative Instruments Included within Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	May 31, 2018	May 31, 2017
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 400	$ 241
Derivative Liabilities	190	254
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	270	126
Derivative Liabilities	156	132
Designated as Hedging Instrument | Foreign Exchange Contract | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	118	113
Designated as Hedging Instrument | Foreign Exchange Contract | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	152	13
Designated as Hedging Instrument | Foreign Exchange Contract | Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	156	59
Designated as Hedging Instrument | Foreign Exchange Contract | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	73
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	130	115
Derivative Liabilities	34	122
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	119	103
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	2
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	26	107
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	7
Derivatives not designated as hedging instruments | Embedded derivatives | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	3	1
Derivatives not designated as hedging instruments | Embedded derivatives | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	8	9
Derivatives not designated as hedging instruments | Embedded derivatives | Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	2	2
Derivatives not designated as hedging instruments | Embedded derivatives | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 6	$ 6