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Investments - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-Sale [Line Items] |  |
Short-term investments | $ 4,318 | $ 5,144
Accrued investment income | 567 | 539
Fixed income securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Accrued investment income | $ 527 | $ 495

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