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INVESTMENTS (Tables) | 12 Months Ended
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May 31, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments in Equity Securities | The summary of our investments in equity securities at May 31, 2025 and 2024 is as follows (in millions):
| 2025 |  | 2024
Equity securities with readily determinable fair values | $ | 91 |  |  | $ | 100 |
Equity securities without readily determinable fair values - NAV practical expedient | 51 |  |  | 37 |
Equity securities without readily determinable fair values - measurement alternative | 364 |  |  | 223 |
Total equity securities | $ | 506 |  |  | $ | 360 |
Schedule of Investments in Debt Securities | The summary of our investments in debt securities at May 31, 2025 and 2024 is as follows (in millions):
| 2025 |  | 2024
|  |  | Gross Unrealized |  |  |  |  |  | Gross Unrealized |  |
| Cost |  | Gains |  | Losses |  | Estimated Fair Value |  | Cost |  | Gains |  | Losses |  | Estimated Fair Value
Fixed-income securities | $ | 69 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 70 |  |  | $ | 76 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 77 |
Total debt securities | $ | 69 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 70 |  |  | $ | 76 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 77 |

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