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Investments (Tables) | 12 Months Ended
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May 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Summary of Investments in Equity Securities | The summary of our investments in equity securities at May 31, 2024 and 2023 is as follows (in millions):
|  | 2024 |  |  | 2023 |
Equity securities with readily determinable fair values |  | $ | 100 |  |  | $ | 91 |
Equity securities without readily determinable fair values - NAV practical expedient |  |  | 37 |  |  |  | 26 |
Equity securities without readily determinable fair values - measurement alternative |  |  | 223 |  |  |  | 185 |
Total equity securities |  | $ | 360 |  |  | $ | 302 |
Schedule of Debt Securities | The carrying values of our investments in debt securities are classified as available-for-sale and reported at their estimated fair values in our consolidated balance sheets and consisted of the following (in millions):
|  |  |  |  | Gross Unrealized |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Estimated Fair Value |
May 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Fixed-income securities |  | $ | 76 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 77 |
Total debt securities |  | $ | 76 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 77 |

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