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Other Insurance Liabilities and Separate Accounts - Separate Account Assets (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | $ 1,934 | $ 3,311 |  |
Separate accounts liabilities | 1,934 | 3,311 | $ 3,334 | $ 3,250
Recurring |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 1,891 | 3,499 |  |
Recurring | Other Receivables |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 43 |  |  |
Recurring | Other Payables |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts liabilities |  | 188 |  |
Recurring | Cash and cash equivalents |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 160 | 165 |  |
Recurring | Debt securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 394 | 856 |  |
Recurring | Debt securities | U.S. government securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 36 | 186 |  |
Recurring | Debt securities | States, municipalities and political subdivisions |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 11 | 14 |  |
Recurring | Debt securities | U.S. corporate securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 290 | 524 |  |
Recurring | Debt securities | Foreign securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 42 | 51 |  |
Recurring | Mortgage-backed securities | Residential mortgage-backed securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 7 | 71 |  |
Recurring | Mortgage-backed securities | Commercial mortgage-backed securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 3 | 3 |  |
Recurring | Other asset-backed securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 5 | 7 |  |
Recurring | Common/collective trusts |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | $ 1,337 | $ 2,478 |  |

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