Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 950	$ 791	$ 2,914	$ 2,408
Other comprehensive income (loss), net of tax:
Change in net foreign currency translation adjustment	(111)	15	(221)	(17)
Change in net gains (losses) on cash flow hedges	(350)	569	(389)	1,037
Change in net gains (losses) on other	(1)	2	9	6
Total other comprehensive income (loss), net of tax	(462)	586	(601)	1,026
TOTAL COMPREHENSIVE INCOME	$ 488	$ 1,377	$ 2,313	$ 3,434