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DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2016 | May 31, 2015 | May 31, 2014
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract] |  |  |
Net gains (losses) related to forward contracts | $ 97 | $ 60 | $ (69)
Foreign Currency Forward Contracts Not Designated as Hedges [Member] | Forward contracts held to purchase U.S. Dollars [Member] |  |  |
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract] |  |  |
Notional amounts of forward contracts | 2,700 | 2,200 |
Foreign Currency Forward Contracts Not Designated as Hedges [Member] | Forward contracts held to sell U.S. Dollars [Member] |  |  |
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract] |  |  |
Notional amounts of forward contracts | $ 2,000 | $ 1,200 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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