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v3.23.2

Reinsurance and Indemnification - Claims expense, life contract benefits and interest credited to contractholder funds (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Property and casualty insurance claims and claims expense |  |  |  |
Reductions to costs and expenses due to reinsurance ceded amounts |  |  |  |
Ceded losses incurred | $ 60 | $ (406) | $ (260) | $ (515)
Ceded losses |  |  | 37 |
Accident, health and other policy benefits |  |  |  |
Reductions to costs and expenses due to reinsurance ceded amounts |  |  |  |
Ceded losses incurred | $ (17) | $ (10) | $ (25) | $ (17)

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- Definition Ceded Income (Losses) + References No definition available. + Details
Name: | all_CededIncomeLosses
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of reinsurance ceded under various contracts. + References No definition available. + Details
Name: | all_ReinsuranceCededAmount
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | all_ReinsuranceClaimsBenefitsCededAbstract
Namespace Prefix: | all_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=all_PropertyLiabilityInsuranceClaimsAndClaimsExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=all_AccidentHealthAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |