Accumulated Other Comprehensive Income - Reclassification out of AOCI (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Revenues	$ 7,380us-gaap_SalesRevenueNet	$ 6,431us-gaap_SalesRevenueNet	$ 15,362us-gaap_SalesRevenueNet	$ 13,402us-gaap_SalesRevenueNet
Cost of sales	(4,053)us-gaap_CostOfGoodsSold	(3,605)us-gaap_CostOfGoodsSold	(8,314)us-gaap_CostOfGoodsSold	(7,444)us-gaap_CostOfGoodsSold
Total selling and administrative expense	(2,438)	(2,091)	(4,918)	(4,149)
Other expense (income), net	(2)us-gaap_OtherNonoperatingIncomeExpense	(13)us-gaap_OtherNonoperatingIncomeExpense	(5)us-gaap_OtherNonoperatingIncomeExpense	(41)us-gaap_OtherNonoperatingIncomeExpense
Total before tax	878	714	2,107	1,752
Tax benefit (expense)	(223)us-gaap_IncomeTaxExpenseBenefit	(180)us-gaap_IncomeTaxExpenseBenefit	(490)us-gaap_IncomeTaxExpenseBenefit	(439)us-gaap_IncomeTaxExpenseBenefit
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
NET INCOME	25	14	12	43
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	15	20	(5)	55
Tax benefit (expense)	3	(5)	7	(10)
NET INCOME	18	15	2	45
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	(19)	7	(36)	21
Cost of sales	21	7	13	23
Total selling and administrative expense	0	0	0	0
Other expense (income), net	13	6	18	11
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	9	(1)	13	(2)
Total before tax	9	(1)	13	(2)
Tax benefit (expense)	(2)	0	(3)	0
NET INCOME	$ 7	$ (1)	$ 10	$ (2)

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Total costs related to goods produced and sold during the reporting period.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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