Operating Segments and Related Information - Revenues by Major Product Line (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Revenue from External Customer [Line Items]
Revenues	$ 25,313	$ 23,331	$ 20,117
Footwear
Revenue from External Customer [Line Items]
Revenues	14,539	13,428	11,519
Apparel
Revenue from External Customer [Line Items]
Revenues	6,820	6,336	5,516
Equipment
Revenue from External Customer [Line Items]
Revenues	1,405	1,204	1,022
Other products
Revenue from External Customer [Line Items]
Revenues	$ 2,549	$ 2,363	$ 2,060