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v3.23.1

Reserve for Future Policy Benefits and Contractholder Funds - Schedule of actual and expected experience for mortality, morbidity and lapses (Details) - Lapses | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | ---
Accident and health insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Actual to expected ratio | 90.00% | 111.00%
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Actual to expected ratio | 92.00% | 95.00%

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- Definition Liability for Future Policy Benefits, Interest Rate, Actual to Expected Ratio + References No definition available. + Details
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Namespace Prefix: | all_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputLapseRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=all_AllstateAccidentAndHealthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=all_TraditionalLifeInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |