Risk Management and Derivatives - FV of Derivative Instruments Included within Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	May 31, 2019	May 31, 2018
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	$ 622	$ 400
DERIVATIVE LIABILITIES	54	190
Derivatives formally designated as hedging instruments
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	509	270
DERIVATIVE LIABILITIES	5	156
Derivatives formally designated as hedging instruments | Foreign Exchange Contract | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	509	118
Derivatives formally designated as hedging instruments | Foreign Exchange Contract | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	0	152
Derivatives formally designated as hedging instruments | Foreign Exchange Contract | Accrued liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	5	156
Derivatives formally designated as hedging instruments | Foreign Exchange Contract | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	0	0
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	113	130
DERIVATIVE LIABILITIES	49	34
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	102	119
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Accrued liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	46	26
Derivatives not designated as hedging instruments | Embedded derivatives | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	5	3
Derivatives not designated as hedging instruments | Embedded derivatives | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	6	8
Derivatives not designated as hedging instruments | Embedded derivatives | Accrued liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	1	2
Derivatives not designated as hedging instruments | Embedded derivatives | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	$ 2	$ 6