Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 4,240	$ 3,760	$ 3,273
Other comprehensive income (loss), net of tax:
Change in net foreign currency translation adjustment	16	(176)	(20)
Change in net gains (losses) on cash flow hedges	(515)	(757)	1,188
Change in net gains (losses) on other	(32)	5	(7)
Total other comprehensive income (loss), net of tax	(531)	(928)	1,161
TOTAL COMPREHENSIVE INCOME	$ 3,709	$ 2,832	$ 4,434