XML 153 R125.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Reinsurance and Indemnification - 2019-1 PCS Excess Agreement (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) state
Ceded Credit Risk [Line Items] |
Limit of aggregate losses under aggregate excess agreement | $ 3,400
2019-1 Excess Catastrophe Reinsurance Contract |
Ceded Credit Risk [Line Items] |
Number of states covered by reinsurance agreement | state | 49
Retention percentage of reinsurance limit | 75.00%
Retention amount for catastrophe reinsurance agreement contracts | $ 400
Retention amount annual limit | $ 2,750
Co-participation percentage | 5.00%
Retention amount for catastrophe reinsurance agreement contracts, losses in excess | $ 3,070
Minimum | 2019-1 Excess Catastrophe Reinsurance Contract |
Ceded Credit Risk [Line Items] |
Retention amount for catastrophe reinsurance agreement contracts | 3,540
Maximum | 2019-1 Excess Catastrophe Reinsurance Contract |
Ceded Credit Risk [Line Items] |
Retention amount for catastrophe reinsurance agreement contracts | $ 3,940

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 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 Catastrophe Reinsurance Agreement Contracts, Retention Amount Annual limit + References No definition available. + Details
Name: | all_CatastropheReinsuranceAgreementContractsRetentionAmountAnnuallimit
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Catastrophe Reinsurance Agreement Contracts, Retention Amount, Contractual Coverage + References No definition available. + Details
Name: | all_CatastropheReinsuranceAgreementContractsRetentionAmountContractualCoverage
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of states covered under the reinsurance agreement. + References No definition available. + Details
Name: | all_NumberOfStatesCoveredUnderReinsuranceAgreement
Namespace Prefix: | all_
Data Type: | xbrli:integerItemType
Balance Type: | na
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_A20191ExcessCatastropheReinsuranceContractMember
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: |

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