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Investments - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Mortgage loans, net | $ 807 | $ 784
Short-term investments | 9,640 | 4,537
Accrued investment income | 628 | 615
Residential |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Mortgage loans, net | 112 | 61
Fixed income securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Accrued investment income | $ 568 | $ 574

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