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Investments - Schedule of Gross Realized Gains (Losses) on Sales of Fixed Income Securities (Details) - Fixed income securities - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross realized gains | $ 116 | $ 33 | $ 187 | $ 74
Gross realized losses | $ (367) | $ (124) | $ (565) | $ (270)

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