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Investments - Investments (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Investments, Debt and Equity Securities [Abstract] |  |
Available-for-sale securities | $ 316 | $ 292
Held-to-maturity securities | 19 | 38
Total investments | $ 335 | $ 330

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