Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Deferred income taxes and other long-term liabilities
Defined Contribution Plan Disclosure [Line Items]
Deferred compensation plan liabilities	$ 443	$ 390
Liability related to the unfunded pension plan	98	100
General and Administrative Expense
Defined Contribution Plan Disclosure [Line Items]
401(k) employee savings plans, expenses	58	51	$ 46
General and Administrative Expense | Profit Sharing Plan
Defined Contribution Plan Disclosure [Line Items]
Contribution and cash award expenses included in selling and administrative expenses	58	49	47
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	$ 68	$ 46	$ 50