Operating Segments and Related Information - Revenues by Major Product Line (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Revenue from External Customer [Line Items]
Revenues	$ 27,799	$ 25,313	$ 23,331
Footwear
Revenue from External Customer [Line Items]
Revenues	16,208	14,635	13,513
Apparel
Revenue from External Customer [Line Items]
Revenues	8,109	7,491	6,958
Equipment
Revenue from External Customer [Line Items]
Revenues	1,670	1,640	1,429
Other
Revenue from External Customer [Line Items]
Revenues	$ 1,812	$ 1,547	$ 1,431