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Investments - Investments (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Investments, Debt and Equity Securities [Abstract] |  |
Available-for-sale securities | $ 292 | $ 286
Held-to-maturity securities 1 | 38 | 306
Investments | $ 330 | $ 592

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