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v3.25.1

Reinsurance and Indemnification - Additional Information (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2025 USD ($)
Allstate Health and Benefits |
Reinsurance |
Reinsurance recoverable, allowance for credit loss, held for sale | $ 1

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- Definition Reinsurance Recoverable, Allowance for Credit Loss, Held For Sale + References No definition available. + Details
Name: | all_ReinsuranceRecoverableAllowanceForCreditLossHeldForSale
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_EffectsOfReinsuranceLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=all_AllstateHealthAndBenefitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |