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Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Skyland |  |  |
Variable Interest Entity [Line Items] |  |  |
Quota share (as a percent) | 100.00% |  |
Adirondack |  |  |
Variable Interest Entity [Line Items] |  |  |
Quota share (as a percent) | 36.50% |  |
Variable Interest Entity, Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Management fee | $ 10 | $ 11 |
Notes payable | 123 |  | $ 123
Valuation allowance | 123 |  |
Variable Interest Entity, Primary Beneficiary | Consolidation, Eliminations |  |  |
Variable Interest Entity [Line Items] |  |  |
Ceded losses incurred | 12 | 7 |
Variable Interest Entity, Primary Beneficiary | Allstate Protection |  |  |
Variable Interest Entity [Line Items] |  |  |
Insurance premiums and contract charges | 61 | 57 |
Costs and expenses | $ 87 | $ 59 |

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