XML 78 R126.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Reinsurance and Indemnification - Wrap Fill Excess Catastrophe Reinsurance Contract (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($)
Ceded Credit Risk [Line Items] |
Limit of aggregate losses under aggregate excess agreement | $ 3,400
Wrap Fill Excess Catastrophe Reinsurance Contract |
Ceded Credit Risk [Line Items] |
Retention amount for catastrophe reinsurance agreement contracts | $ 200
Co-participation percentage | 5.00%
Retention percentage of reinsurance limit | 100.00%
Limit of aggregate losses under aggregate excess agreement | $ 1,610
Catastrophe reinsurance aggregate loss limit | 3,070
Minimum | Wrap Fill Excess Catastrophe Reinsurance Contract |
Ceded Credit Risk [Line Items] |
Retention amount for catastrophe reinsurance agreement contracts | $ 2,750

X
- Definition Represents the retention percentage of annual coverage limit provided by the insurance arrangement for catastrophe claims. + References No definition available. + Details
Name: | all_CatastropheInsuranceAnnualCoverageLimitRetentionPercentage
Namespace Prefix: | all_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The limit of aggregated losses per contract year beyond which coverage provided by an aggregate excess agreement applies. + References No definition available. + Details
Name: | all_CatastropheReinsuranceAggregateLossLimitPerContractYear
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Catastrophe Reinsurance Aggregate Loss Limit Per Contract Year, In Excess of Layers + References No definition available. + Details
Name: | all_CatastropheReinsuranceAggregateLossLimitPerContractYearInExcessofLayers
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Catastrophe Reinsurance Agreement Contracts, Co-participation Percentage + References No definition available. + Details
Name: | all_CatastropheReinsuranceAgreementContractsCoparticipationPercentage
Namespace Prefix: | all_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the retention amount of catastrophe reinsurance agreement contracts. + References No definition available. + Details
Name: | all_CatastropheReinsuranceAgreementContractsRetentionAmount
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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_CededCreditRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CededCreditRiskAxis=all_WrapFillExcessCatastropheReinsuranceContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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