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CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES | 12 Months Ended
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May 31, 2019
Cash Cash Equivalents And Short Term Investments [Abstract] |
CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES |
3. | CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES
Cash and cash equivalents primarily consist of deposits held at major banks, Tier-1 commercial paper debt securities and other securities with original maturities of 90 days or less. Marketable securities consist of Tier-1 commercial paper debt securities, corporate debt securities and certain other securities. The amortized principal amounts of our cash, cash equivalents and marketable securities approximated their fair values at May 31, 2019 and 2018. We use the specific identification method to determine any realized gains or losses from the sale of our marketable securities classified as available-for-sale. Such realized gains and losses were insignificant for fiscal 2019, 2018 and 2017. The following table summarizes the components of our cash equivalents and marketable securities held, substantially all of which were classified as available-for-sale:
|  | May 31, |
(in millions) |  | 2019 |  |  | 2018 |
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 |
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. Our investment portfolio is subject to market risk due to changes in interest rates. As described above, we limit purchases of marketable debt securities to investment-grade securities, which have high credit ratings and also limit the amount of credit exposure to any one issuer. As stated in our investment policy, we are averse to principal loss and seek to preserve our invested funds by limiting default risk and market risk. 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 The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -URI http://asc.fasb.org/topic&trid=2122426 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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