Operating Segments and Related Information - Revenues by Major Product Line (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Revenue from External Customer [Line Items]
Revenues	$ 34,350	$ 32,376	$ 30,601
Footwear
Revenue from External Customer [Line Items]
Revenues	21,081	19,871	18,318
Apparel
Revenue from External Customer [Line Items]
Revenues	9,654	9,067	8,637
Equipment
Revenue from External Customer [Line Items]
Revenues	1,425	1,496	1,631
Other
Revenue from External Customer [Line Items]
Revenues	$ 2,190	$ 1,942	$ 2,015