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Investments - Short-Term and Long-Term Investment Securities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Investment securities |  |
Total available-for-sale investment securities | $ 1,333 | $ 330
Total held-to-maturity investment securities | 175 | 234
Total investments in debt securities | 1,508 | 564
Time deposits |  |
Investment securities |  |
Total available-for-sale investment securities | 1,310 | 290
Commercial paper |  |
Investment securities |  |
Total available-for-sale investment securities | 7 | 24
Debt securities |  |
Investment securities |  |
Total available-for-sale investment securities | 16 | 16
Corporate bonds |  |
Investment securities |  |
Total held-to-maturity investment securities | $ 175 | $ 234

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