Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Deferred income taxes and other long-term liabilities
Defined Contribution Plan Disclosure [Line Items]
Deferred compensation plan liabilities	$ 725	$ 647
Liability related to the unfunded pension plan	79	73
General and Administrative Expense
Defined Contribution Plan Disclosure [Line Items]
401(k) employee savings plans, expenses	107	90	$ 80
General and Administrative Expense | Profit Sharing Plan
Defined Contribution Plan Disclosure [Line Items]
Contribution and cash award expenses included in selling and administrative expenses	0	37	59
General and Administrative Expense | Long Term Incentive Plan
Defined Contribution Plan Disclosure [Line Items]
Contribution and cash award expenses included in selling and administrative expenses	$ 66	$ 83	$ 33