Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 1,249	$ 1,179
Other comprehensive income (loss), net of tax:
Change in net foreign currency translation adjustment	3	(81)
Change in net gains (losses) on cash flow hedges	(240)	(329)
Change in net gains (losses) on other	4	(3)
Total other comprehensive income (loss), net of tax	(233)	(413)
TOTAL COMPREHENSIVE INCOME	$ 1,016	$ 766