Risk Management and Derivatives - FV of Derivative Instruments Included within Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	Aug. 31, 2020	May 31, 2020
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	$ 48	$ 95
DERIVATIVE LIABILITIES	656	207
Derivatives formally designated as hedging instruments
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	16	44
DERIVATIVE LIABILITIES	632	190
Derivatives formally designated as hedging instruments | Foreign exchange forwards and options | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	13	43
Derivatives formally designated as hedging instruments | Foreign exchange forwards and options | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	3	1
Derivatives formally designated as hedging instruments | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	488	173
Derivatives formally designated as hedging instruments | Foreign exchange forwards and options | Deferred income taxes and other liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	144	17
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	32	51
DERIVATIVE LIABILITIES	24	17
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	30	48
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Deferred income taxes and other assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	2	2
Derivatives not designated as hedging instruments | Foreign exchange forwards and options | Accrued liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	23	15
Derivatives not designated as hedging instruments | Embedded derivatives | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
DERIVATIVE ASSETS	0	1
Derivatives not designated as hedging instruments | Embedded derivatives | Accrued liabilities
Derivatives, Fair Value [Line Items]
DERIVATIVE LIABILITIES	$ 1	$ 2