Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Significant Accounting Policies [Line Items]
Total advertising and promotion expenses	$ 3,592	$ 3,753	$ 3,577
Prepaid advertising and promotion expenses	686	773
Allowance for uncollectible accounts receivable	$ 214	30
Minimum | Building
Significant Accounting Policies [Line Items]
Property, plant and equipment, minimum useful life (in years)	2 years
Minimum | Leasehold improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, minimum useful life (in years)	2 years
Minimum | Machinery and Equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, minimum useful life (in years)	2 years
Minimum | Software and Software Development Costs
Significant Accounting Policies [Line Items]
Property, plant and equipment, minimum useful life (in years)	2 years
Minimum | Land Improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, minimum useful life (in years)	2 years
Maximum | Building
Significant Accounting Policies [Line Items]
Property, plant and equipment, minimum useful life (in years)	40 years
Maximum | Leasehold improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, minimum useful life (in years)	40 years
Maximum | Machinery and Equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, minimum useful life (in years)	15 years
Maximum | Software and Software Development Costs
Significant Accounting Policies [Line Items]
Property, plant and equipment, minimum useful life (in years)	12 years
Maximum | Land Improvements
Significant Accounting Policies [Line Items]
Property, plant and equipment, minimum useful life (in years)	40 years
Prepaid expenses and other current assets
Significant Accounting Policies [Line Items]
Prepaid advertising and promotion expenses	$ 326	333
Deferred income taxes and other assets
Significant Accounting Policies [Line Items]
Prepaid advertising and promotion expenses	$ 360	$ 440