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Variable Interest Entities - Narrative (Details) - Variable Interest Entity, Primary Beneficiary - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Variable Interest Entity [Line Items] |  |  |  |  |
Notes payable | $ 123 |  | $ 123 |  | $ 123
Allstate Protection |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Insurance premiums and contract charges | 59 | $ 39 | 173 | $ 122 |
Costs and expenses | $ 58 | $ 61 | $ 202 | $ 174 |

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