Accumulated Other Comprehensive Income - Reclassification out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Nov. 30, 2015	Aug. 31, 2015	Nov. 30, 2014	Nov. 30, 2015		Nov. 30, 2014
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Revenues	$ (7,686)		$ (7,380)	$ (16,100)		$ (15,362)
Cost of sales	4,185		4,053	8,604		8,314
Total selling and administrative expense	2,560		2,438	5,137		4,918
Other (income) expense, net	34		(2)	65		(5)
Total before tax	970		878	2,415		2,107
Tax (expense) benefit	(185)		(223)	(451)		(490)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
NET INCOME	133		25	323	[1]	12
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	135		15	323	[1]	(5)
Tax (expense) benefit	0		3	(1)	[1]	7
NET INCOME	135		18	322	[1]	2
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	(29)		(19)	(75)	[1]	(36)
Cost of sales	125		21	298	[1]	13
Total selling and administrative expense	0		0	0	[1]	0
Other (income) expense, net	39		13	100	[1]	18
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	(2)		9	1	[1]	13
Total before tax	(2)		9	1	[1]	13
Tax (expense) benefit	0		(2)	0	[1]	(3)
NET INCOME	$ (2)		$ 7	$ 1	[1]	$ 10
Revisions
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives		$ 40

[1] Certain amounts have been updated to reflect the proper classification of $40 million between Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income for cash flow hedges for the three months ended August 31, 2015.