Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 1,933	$ 4,240	$ 3,760
Other comprehensive income (loss), net of tax:
Change in net foreign currency translation adjustment	(6)	16	(176)
Change in net gains (losses) on cash flow hedges	76	(515)	(757)
Change in net gains (losses) on other	34	(32)	5
Total other comprehensive income (loss), net of tax	104	(531)	(928)
TOTAL COMPREHENSIVE INCOME	$ 2,037	$ 3,709	$ 2,832