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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 | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Debt Securities, Available-for-Sale [Line Items] |  |  |  |
Gross realized gains | $ 201 | $ 11 | $ 275 | $ 85
Gross realized losses | $ (93) | $ (133) | $ (363) | $ (459)

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