Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 847	$ 767	$ 1,939	$ 1,717
Other comprehensive income (loss), net of tax:
Change in net foreign currency translation adjustment	(2)	(8)	(130)	14
Change in net gains (losses) on cash flow hedges	241	8	434	(387)
Change in net gains (losses) on other	0	(1)	(3)	(1)
Total other comprehensive income (loss), net of tax	239	(1)	301	(374)
TOTAL COMPREHENSIVE INCOME	$ 1,086	$ 766	$ 2,240	$ 1,343