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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

X

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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