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Other Insurance Liabilities and Separate Accounts - Separate Account Assets (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts liabilities | $ 3,334 | $ 3,250 | $ 3,200 | $ 3,228
Separate accounts assets | 3,334 | 3,250 |  |
Recurring |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 3,436 | 3,204 |  |
Recurring | Other Payables |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts liabilities | 102 |  |  |
Recurring | Other Receivables |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets |  | 46 |  |
Recurring | Cash and cash equivalents |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 165 | 168 |  |
Recurring | Debt securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 899 | 2,507 |  |
Recurring | Debt securities | U.S. government securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 223 | 573 |  |
Recurring | Debt securities | States, municipalities and political subdivisions |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 16 | 28 |  |
Recurring | Debt securities | U.S. corporate securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 527 | 1,632 |  |
Recurring | Debt securities | Foreign securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 52 | 202 |  |
Recurring | Mortgage-backed securities | Residential mortgage-backed securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 68 | 51 |  |
Recurring | Mortgage-backed securities | Commercial mortgage-backed securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 3 | 6 |  |
Recurring | Other asset-backed securities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 10 | 15 |  |
Recurring | Common/collective trusts |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | $ 2,372 | $ 529 |  |

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