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Reinsurance and Indemnification - Schedule of Effects of Reinsurance Ceded and Indemnification Programs on Property and Casualty Insurance Claims and Claims Expense and Accident, Health and Other Policy Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Property and casualty insurance claims and claims expense |  |  |  |
Reductions to costs and expenses due to reinsurance ceded amounts |  |  |  |
Ceded losses incurred | $ (274) | $ (925) | $ (534) | $ (1,300)
Ceded losses |  | 305 | 60 | 305
Accident, health and other policy benefits |  |  |  |
Reductions to costs and expenses due to reinsurance ceded amounts |  |  |  |
Ceded losses incurred | $ (7) | $ 39 | $ (32) | $ 22

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

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- Details
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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: |