Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 842	$ 785	$ 2,091	$ 1,964
Other comprehensive income (loss), net of tax:
Change in net foreign currency translation adjustment	(14)	(29)	(11)	(110)
Change in net gains (losses) on cash flow hedges	323	290	83	(39)
Change in net gains (losses) on other	5	13	9	10
Total other comprehensive income (loss), net of tax	314	274	81	(139)
TOTAL COMPREHENSIVE INCOME	$ 1,156	$ 1,059	$ 2,172	$ 1,825