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CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2019 | May 31, 2018
Cash Cash Equivalents And Short Term Investments [Abstract] |  |
Corporate debt securities and other | $ 22,242 | $ 44,302
Commercial paper debt securities |  | 1,647
Money market funds | 5,700 | 6,500
Total investments | 27,942 | 52,449
Investments classified as cash equivalents | 10,629 | 6,808
Investments classified as marketable securities | $ 17,313 | $ 45,641
Percentage of marketable securities investments mature within one year | 33.00% | 26.00%
Percentage of marketable securities investments mature within one to five years | 67.00% | 74.00%
Maturity of marketable security investments | As of May 31, 2019 and 2018, approximately 33% and 26%, respectively, of our marketable securities investments mature within one year and 67% and 74%, respectively, mature within one to four years. |
Restricted cash and cash equivalent item, description | Restricted cash that was included within cash and cash equivalents as presented within our consolidated balance sheets as of May 31, 2019 and 2018 and our consolidated statements of cash flows for the years ended May 31, 2019, 2018 and 2017 was nominal. |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26626-111562 + Details
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- Definition Amount of short-term, 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 No definition available. + Details
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