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Investments - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-Sale [Line Items] |  |
Mortgage loans, net | $ 770 | $ 784
Short-term investments | 6,541 | 4,537
Accrued investment income | 614 | 615
Fixed income securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Accrued investment income | 575 | 574
Residential Mortgage |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Mortgage loans, net | $ 80 | $ 61

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