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CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES | 12 Months Ended
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May. 31, 2015
Cash, Cash Equivalents and Marketable Securities [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 and other securities with original maturities of 90 days or less. Marketable securities primarily consist of time deposits held at major banks, Tier-1 commercial paper, corporate notes and certain other securities. The amortized principal amounts of our cash, cash equivalents and marketable securities approximated their fair values at May 31, 2015 and 2014. 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 2015, 2014 and 2013. 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) |  | 2015 |  | 2014
U.S. Treasury securities |  | $ | 668 |  | $ | —
Commercial paper debt securities |  |  | 9,203 |  |  | 7,969
Corporate debt securities and other |  |  | 28,844 |  |  | 16,657
Total investments |  | $ | 38,715 |  | $ | 24,626
Investments classified as cash equivalents |  | $ | 6,063 |  | $ | 3,576
Investments classified as marketable securities |  | $ | 32,652 |  | $ | 21,050
As of May 31, 2015 and 2014, approximately 28% and 45%, respectively, of our marketable securities investments mature within one year and 72% and 55%, respectively, mature within one to six 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.

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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 No definition available. + Details
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