Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2015	Nov. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 785	$ 655	$ 1,964	$ 1,617
Other comprehensive income (loss), net of tax:
Change in net foreign currency translation adjustment	(29)	(34)	(110)	(32)
Change in net gains (losses) on cash flow hedges	290	333	(39)	468
Change in net gains (losses) on other	13	2	10	4
Total other comprehensive income (loss), net of tax	274	301	(139)	440
TOTAL COMPREHENSIVE INCOME	$ 1,059	$ 956	$ 1,825	$ 2,057