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Investments - Schedule of Payment Status of Mortgage Loans (Details) - Mortgage loans - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | $ 849 |
Allowance | (18) |
Total mortgage loans | 831 |
Commercial |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 697 | $ 735
Allowance | (17) |
Total mortgage loans | 680 |
Residential |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 152 |
Allowance | (1) |
Total mortgage loans | 151 |
Less than 90 days past due |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 24 |
Less than 90 days past due | Commercial |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 23 |
Less than 90 days past due | Residential |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 1 |
90 days or greater past due |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
90 days or greater past due | Commercial |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
90 days or greater past due | Residential |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 0 |
Total past due before allowance |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 24 |
Total past due before allowance | Commercial |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 23 |
Total past due before allowance | Residential |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 1 |
Current before allowance |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 825 |
Current before allowance | Commercial |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | 674 |
Current before allowance | Residential |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized cost before allowance | $ 151 |

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