Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (921)	$ 1,141	$ 796	$ 3,232
Other comprehensive (loss) income, net of tax:
Change in net foreign currency translation adjustment	51	12	65	1
Change in net gains (losses) on cash flow hedges	(107)	(175)	(494)	(92)
Change in net gains (losses) on other	2	(7)	1	2
Total other comprehensive (loss) income, net of tax	(54)	(170)	(428)	(89)
TOTAL COMPREHENSIVE (LOSS) INCOME	$ (975)	$ 971	$ 368	$ 3,143