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Investments - Investments (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Available-for-sale securities | $ 289 | $ 292
Held-to-maturity securities | 30 | 38
Total investments | $ 319 | $ 330

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