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Other Insurance Liabilities and Separate Accounts - Separate Account Assets (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | $ 3,200 | $ 3,228 |  |
Separate accounts liabilities | 3,200 | 3,228 | $ 3,318 | $ 5,087
Recurring |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 3,159 | 3,313 |  |
Other Receivables | Recurring |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 41 |  |  |
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 | 153 | 156 |  |
Debt securities | Recurring |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 2,563 | 2,677 |  |
Debt securities | U.S. government securities | Recurring |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 671 | 717 |  |
Debt securities | States, municipalities and political subdivisions | Recurring |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 26 | 27 |  |
Debt securities | U.S. corporate securities | Recurring |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 1,610 | 1,667 |  |
Debt securities | Foreign securities | Recurring |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 198 | 201 |  |
Mortgage-backed securities | Residential mortgage-backed securities | Recurring |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate accounts assets | 37 | 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 | $ 443 | $ 480 |  |

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