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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions | May 31, 2016 | May 31, 2015
--- | --- | ---
Assets [Abstract] |  |  |
Money market funds |  | $ 3,750 |
U.S. Treasury securities |  | 214 | $ 668
Commercial paper debt securities |  | 2,155 | 9,203
Corporate debt securities and other |  | 35,274 | 28,844
Derivative financial instruments | [1] | 122 | 74
Total assets |  | 41,515 | 38,789
Liabilities [Abstract] |  |  |
Derivative financial instruments |  | 218 | 244
Short and Long Term Debt [Abstract] |  |  |
Short-term borrowings |  | 3,750 | 1,999
Senior notes |  | 40,100 | 42,000
Fair Value Measurements Using Input Types Level 1 [Member] |  |  |
Assets [Abstract] |  |  |
Money market funds |  | 3,750 |
U.S. Treasury securities |  | 214 | 668
Corporate debt securities and other |  | 179 | 190
Total assets |  | 4,143 | 858
Fair Value Measurements Using Input Types Level 2 [Member] |  |  |
Assets [Abstract] |  |  |
Commercial paper debt securities |  | 2,155 | 9,203
Corporate debt securities and other |  | 35,095 | 28,654
Derivative financial instruments |  | 122 | 74
Total assets |  | 37,372 | 37,931
Liabilities [Abstract] |  |  |
Derivative financial instruments |  | 218 | 244
Total debt fair value |  | $ 43,200 | $ 44,100
[1] | We have entered into certain interest rate swap agreements that have the economic effects of modifying the fixed-interest obligations associated with the 2.375% senior notes due January 2019 (January 2019 Notes), the 2.25% senior notes due October 2019 (October 2019 Notes) and the 2.80% senior notes due July 2021 (July 2021 Notes) so that the interest payable on these notes effectively became variable based on LIBOR. The effective interest rates after consideration of these fixed to variable interest rate swap agreements were 1.28% and 0.93% for the January 2019 Notes, 1.11% and 0.76% for the October 2019 Notes, and 1.26% and 0.91% for the July 2021 Notes as of May 31, 2016 and 2015, respectively. Refer to Notes 1 and 11 for a description of our accounting for fair value hedges.

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- Definition Unsecured short-term debt instrument issued by corporations which are highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3052-108585 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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