Accumulated Other Comprehensive Income - Reclassification out of AOCI (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ (3,869)	$ (3,451)	$ (11,313)	$ (10,522)
Selling and administrative expense	(2,166)	(1,863)	(6,310)	(5,758)
Other expense (income), net	(45)	(17)	(86)	28
Total before tax	883	858	2,640	2,370
Tax benefit (expense)	(198)	(196)	(638)	(602)
NET INCOME FROM CONTINUING OPERATIONS	685	662	2,002	1,768
February 28, 2014
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
NET INCOME FROM CONTINUING OPERATIONS	(11)		32
Gain (losses) on cash flow hedges | February 28, 2014
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(11)		44
Tax benefit (expense)	1		(9)
NET INCOME FROM CONTINUING OPERATIONS	(10)		35
Gain (losses) on cash flow hedges | Foreign exchange forwards and options | February 28, 2014
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Revenue	(1)		20
Cost of sales	(5)		18
Selling and administrative expense	0		0
Other expense (income), net	(5)		6
Other | February 28, 2014
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other expense (income), net	(1)		(3)
Total before tax	(1)		(3)
Tax benefit (expense)	0		0
NET INCOME FROM CONTINUING OPERATIONS	$ (1)		$ (3)