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v3.20.1

Guarantees and Contingent Liabilities (Details) | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($)
Minimum |
Proceedings: |
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued | $ 0
Maximum |
Proceedings: |
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued | $ 75,000,000

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

X
- Definition Estimate of the reasonably possible pretax loss exposure in excess of the amount accrued for the entity's lawsuits, regulatory inquiries and other legal proceedings. + References No definition available. + Details
Name: | all_LossContingencyReasonablyPossibleAdditionalLossesPretaxEstimate
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |