Summary of Significant Accounting Policies - Additional Information (Detail)		3 Months Ended	6 Months Ended	12 Months Ended
	Nov. 15, 2012	Aug. 31, 2014 USD ($)	Nov. 30, 2014 USD ($)	May. 31, 2015 USD ($)	May. 31, 2014 USD ($)	May. 31, 2013 USD ($)	Dec. 24, 2012	May. 31, 2012 USD ($)
Significant Accounting Policies [Line Items]
Assets of disposal group, including intangibles, goodwill and fixed assets				$ 0	$ 0
Liabilities of disposal group				0	0
Stock split ratio for 100 percent of stock dividend declared	2
Dividend payable as result of stock split (as a percent)							100.00%
Reserve balances for sales discounts, returns and miscellaneous claims				724,000,000	610,000,000
Total advertising and promotion expenses				3,213,000,000	3,031,000,000	$ 2,745,000,000
Prepaid advertising and promotion expenses				455,000,000	516,000,000
Allowance for uncollectible accounts receivable				78,000,000	78,000,000
Net increase (decrease) in cash and equivalents		$ 83,000,000	$ 53,000,000	1,632,000,000	(1,117,000,000)	1,083,000,000
Cash and equivalents (Note 6)		2,303,000,000	2,273,000,000	$ 3,852,000,000	2,220,000,000	3,337,000,000		$ 2,254,000,000
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
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)				10 years
Class B Common Stock
Significant Accounting Policies [Line Items]
Stock split ratio for 100 percent of stock dividend declared	2
Class A Convertible Common Stock
Significant Accounting Policies [Line Items]
Stock split ratio for 100 percent of stock dividend declared	2
Other Noncurrent Assets
Significant Accounting Policies [Line Items]
Allowance for uncollectible accounts receivable				$ 24,000,000	37,000,000
Prior Period Revisions to Foreign Currency Adjustments
Significant Accounting Policies [Line Items]
Net increase (decrease) in cash and equivalents				0	0
Scenario, Adjustment | Prior Period Revisions to Foreign Currency Adjustments
Significant Accounting Policies [Line Items]
Net increase (decrease) in cash and equivalents		0	0		0	0
Cash and equivalents (Note 6)		$ 0	$ 0	$ 0	$ 0	$ 0		$ 0