Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 950	$ 1,249
Other comprehensive income (loss), net of tax:
Change in net foreign currency translation adjustment	22	3
Change in net gains (losses) on cash flow hedges	(395)	(240)
Change in net gains (losses) on other	0	4
Total other comprehensive income (loss), net of tax	(373)	(233)
TOTAL COMPREHENSIVE INCOME	$ 577	$ 1,016