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Investments - Short-Term and Long-Term Investment Securities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Investment securities |  |
Available-for-sale investment securities | $ 1,621 | $ 330
Held-to-maturity investment securities | 404 | 234
Total investments in debt securities | 2,025 | 564
Time deposits |  |
Investment securities |  |
Available-for-sale investment securities | 1,148 | 290
Commercial paper |  |
Investment securities |  |
Available-for-sale investment securities | 461 | 24
Debt securities |  |
Investment securities |  |
Available-for-sale investment securities | 12 | 16
Corporate bonds |  |
Investment securities |  |
Held-to-maturity investment securities | $ 404 | $ 234

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