Risk Management and Derivatives - FV of Derivative Instruments Included within Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	Aug. 31, 2019	May 31, 2019
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	$ 581	$ 622
DERIVATIVE LIABILITIES	56	54
Derivatives formally designated as hedging instruments
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	523	509
DERIVATIVE LIABILITIES	18	5
Derivatives formally designated as hedging instruments | Foreign exchange forwards and options | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	494	509
Derivatives formally designated as hedging instruments | Foreign exchange forwards and options | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	29	0
Derivatives formally designated as hedging instruments | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	16	5
Derivatives formally designated as hedging instruments | Foreign exchange forwards and options | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	2	0
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	58	113
DERIVATIVE LIABILITIES	38	49
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	55	102
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	37	46
Derivatives not designated as hedging instruments | Embedded derivatives | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	3	5
Derivatives not designated as hedging instruments | Embedded derivatives | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	0	6
Derivatives not designated as hedging instruments | Embedded derivatives | Accrued liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	1	1
Derivatives not designated as hedging instruments | Embedded derivatives | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	$ 0	$ 2