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Reinsurance and Indemnification - Life and annuity reinsurance recoverables (Details) - Allstate Annuities | 12 Months Ended
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Dec. 31, 2020 reinsurer
Reinsurance Retention Policy [Line Items] |
Percent of morbidity risk ceded for term-life insurance policies | 90.00%
Number of unaffiliated reinsurers | 14

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- Definition The percentage of morbidity risk ceded to reinsurers on term life insurance policies prior to October 2009. + References No definition available. + Details
Name: | all_MorbidityRiskCededTermLifeInsurancePercent
Namespace Prefix: | all_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents reinsurance agreements entered with non associated reinsurers to limit the risk of mortality and morbidity losses. + References No definition available. + Details
Name: | all_UnaffiliatedReinsurers
Namespace Prefix: | all_
Data Type: | xbrli:integerItemType
Balance Type: | na
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_ReinsuranceRetentionPolicyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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