Accumulated Other Comprehensive Income - Reclassification out of AOCI (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ 15,353	$ 14,279	$ 13,183
Selling and administrative expense	8,766	7,796	7,079
Other expense (income), net	(103)	15	(54)
Income before income taxes	3,544	3,256	3,011
Tax benefit (expense)	(851)	(805)	(754)
NET INCOME FROM CONTINUING OPERATIONS	2,693	2,451	2,257
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
NET INCOME FROM CONTINUING OPERATIONS	23
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]
Income before income taxes	36
Tax benefit (expense)	(9)
NET INCOME FROM CONTINUING OPERATIONS	27
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]
Revenue	14
Cost of sales	12
Selling and administrative expense	0
Other expense (income), net	10
Other | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other expense (income), net	(4)
Income before income taxes	(4)
Tax benefit (expense)	0
NET INCOME FROM CONTINUING OPERATIONS	$ (4)