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Other Insurance Liabilities and Separate Accounts - Separate Account Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | $ 3,250 | $ 3,228 |
Separate accounts liabilities | 3,250 | 3,228 | $ 5,087
Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 3,204 | 3,313 |
Other Receivables | Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 46 |  |
Other Payables | Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts liabilities |  | 85 |
Cash and cash equivalents | Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 168 | 156 |
Debt securities | Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 2,507 | 2,677 |
Debt securities | U.S. government securities | Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 573 | 717 |
Debt securities | States, municipalities and political subdivisions | Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 28 | 27 |
Debt securities | U.S. corporate securities | Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 1,632 | 1,667 |
Debt securities | Foreign securities | Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 202 | 201 |
Mortgage-backed securities | Residential mortgage-backed securities | Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 51 | 41 |
Mortgage-backed securities | Commercial mortgage-backed securities | Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 6 | 6 |
Other asset-backed securities | Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | 15 | 18 |
Common/collective trusts | Recurring |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate accounts assets | $ 529 | $ 480 |

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