Accumulated Other Comprehensive Income - Reclassification out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	$ 17	$ 5	$ 82	$ 0
Revenues	(8,032)	(7,460)	(24,132)	(22,822)
Cost of sales	4,343	4,034	12,947	12,348
Total before tax	1,135	1,046	3,550	3,153
Tax (expense) benefit	(185)	(255)	(636)	(745)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
NET INCOME	201	105	524	117
Gains (losses) on foreign currency translation adjustment | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	(2)	0	(2)	0
Total before tax	(2)	0	(2)	0
Tax (expense) benefit	0	0	0	0
NET INCOME	(2)	0	(2)	0
Gain (losses) on cash flow hedges | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	202	99	525	94
Tax (expense) benefit	(3)	(7)	(4)	0
NET INCOME	199	92	521	94
Gain (losses) on cash flow hedges | Foreign exchange forwards and options | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	73	42	173	60
Revenues	(24)	(17)	(99)	(53)
Cost of sales	153	74	451	87
Other | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	4	17	5	30
Total before tax	4	17	5	30
Tax (expense) benefit	0	(4)	0	(7)
NET INCOME	$ 4	$ 13	$ 5	$ 23