Accumulated Other Comprehensive Income - Reclassification out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2015	Aug. 31, 2014
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Revenues	$ (8,414)	$ (7,982)
Cost of sales	4,419	4,261
Total selling and administrative expense	2,577	2,480
Other (income) expense, net	31	(3)
Total before tax	1,445	1,229
Tax (expense) benefit	(266)	(267)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
NET INCOME	150	(13)
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	148	(20)
Tax (expense) benefit	(1)	4
NET INCOME	147	(16)
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]
Revenues	(43)	(17)
Cost of sales	160	(8)
Total selling and administrative expense	0	0
Other (income) expense, net	31	5
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	3	4
Total before tax	3	4
Tax (expense) benefit	0	(1)
NET INCOME	$ 3	$ 3