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v3.19.3.a.u2

Reinsurance and Indemnification - Life and annuity reinsurance recoverables (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) reinsurer
Reinsurance Retention Policy [Line Items] |
Reinsurance recoverables | $ | $ 70
Allstate Annuities |
Reinsurance Retention Policy [Line Items] |
Percent of morbidity risk ceded for term-life insurance policies | 90.00%
Number of unaffiliated reinsurers | reinsurer | 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

X
- 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

X
- Definition Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References No definition available. + Details
Name: | us-gaap_ReinsuranceRecoverablesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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: |