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Investments - Maturity Distribution Based on Contractual Terms of Investment Securities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available-For-Sale Amortized Cost |  |
Due within 1 year | $ 110 |
Due after 1 year through 5 years | 205 |
Amortized Cost | 315 | $ 291
Available-For-Sale Fair Value |  |
Due within 1 year | 110 |
Due after 1 year through 5 years | 206 |
Total | $ 316 | $ 292

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