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Guarantees and Contingent Liabilities (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) claim | Nov. 11, 2016 officer
The Allstate Corp. Securities Litigation |  |
Guarantor Obligations [Line Items] |  |
Number of officers | officer |  | 2
Holland Hewitt v. Allstate Life Insurance Company |  |
Guarantor Obligations [Line Items] |  |
Number of putative class actions | claim | 2 |
Minimum |  |
Guarantor Obligations [Line Items] |  |
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued | $ 0 |
Maximum |  |
Guarantor Obligations [Line Items] |  |
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued | $ 87,000,000 |

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