Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Deferred income taxes and other long-term liabilities
Defined Contribution Plan Disclosure [Line Items]
Deferred compensation plan liabilities	$ 475	$ 443
Liability related to the unfunded pension plan	93	98
General and Administrative Expense
Defined Contribution Plan Disclosure [Line Items]
401(k) employee savings plans, expenses	72	58	$ 51
General and Administrative Expense | Profit Sharing Plan
Defined Contribution Plan Disclosure [Line Items]
Contribution and cash award expenses included in selling and administrative expenses	64	58	49
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	$ 85	$ 68	$ 46