Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Deferred income taxes and other long-term liabilities
Defined Contribution Plan Disclosure [Line Items]
Deferred compensation plan liabilities	$ 569	$ 475
Liability related to the unfunded pension plan	107	93
General and Administrative Expense
Defined Contribution Plan Disclosure [Line Items]
401(k) employee savings plans, expenses	75	72	$ 58
General and Administrative Expense | Profit Sharing Plan
Defined Contribution Plan Disclosure [Line Items]
Contribution and cash award expenses included in selling and administrative expenses	68	64	58
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	$ 21	$ 85	$ 68