Operating Segments and Related Information - Revenues by Major Product Line (Detail) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013
Revenue from External Customer [Line Items]
Revenues	$ 30,601	$ 27,799	$ 25,313
Footwear
Revenue from External Customer [Line Items]
Revenues	18,318	16,208	14,635
Apparel
Revenue from External Customer [Line Items]
Revenues	8,636	8,109	7,491
Equipment
Revenue from External Customer [Line Items]
Revenues	1,632	1,670	1,640
Other
Revenue from External Customer [Line Items]
Revenues	$ 2,015	$ 1,812	$ 1,547