Name:	all_CatastropheInsuranceAnnualCoverageLimitRetentionPercentage
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The limit of aggregated losses per contract year beyond which coverage provided by an aggregate excess agreement applies.

No definition available.

Name:	all_CatastropheReinsuranceAggregateLossLimitPerContractYear
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Represents the period of catastrophe reinsurance agreement contract one.

No definition available.

Name:	all_CatastropheReinsuranceAgreementContractOneTerm
Namespace Prefix:	all_
Data Type:	xbrli:durationItemType
Balance Type:	na
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Represents the retention amount of catastrophe reinsurance agreement contracts.

No definition available.

Name:	all_CatastropheReinsuranceAgreementContractsRetentionAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Represents the period of catastrophe reinsurance agreement.

No definition available.

Name:	all_CatastropheReinsuranceAgreementTerm
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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The gross amount of life insurance in force as of the balance sheet date.

No definition available.

Name:	all_GrossLifeInsuranceInForce
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The percentage of morbidity risk ceded to reinsurers on long-term care contracts.

No definition available.

Name:	all_MorbidityRiskCededLongTermCareContractPercent
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The percentage of morbidity risk ceded to reinsurers on term life insurance policies prior to October 2009.

No definition available.

Name:	all_MorbidityRiskCededTermLifeInsurancePercent
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the number of states covered under the reinsurance agreement.

No definition available.

Name:	all_NumberOfStatesCoveredUnderReinsuranceAgreement
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Data Type:	xbrli:integerItemType
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Represents the amount of reinsurance ceded under various contracts.

No definition available.

Name:	all_ReinsuranceCededAmount
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Data Type:	xbrli:monetaryItemType
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Represents the number of reinsurance contracts under the agreement.

No definition available.

Name:	all_ReinsuranceContractsNumber
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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The retention level per claim or life above which the risk is generally ceded to a reinsurer for contracts issued to individuals age 70 and over.

No definition available.

Name:	all_ReinsuranceRetentionLevelAge70
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Data Type:	xbrli:monetaryItemType
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The retention level per claim or life above which the risk is generally ceded to a reinsurer for certain large contracts that meet specific criteria.

No definition available.

Name:	all_ReinsuranceRetentionLevelSpecificCriteria
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Data Type:	xbrli:monetaryItemType
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Represents reinsurance agreements entered with non associated reinsurers to limit the risk of mortality and morbidity losses.

No definition available.

Name:	all_UnaffiliatedReinsurers
Namespace Prefix:	all_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_CededCreditRiskLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
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Amount of life insurance issued and outstanding ceded to other entities. Includes, but not limited to, dividends and adjustments to face value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 17

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 235

-Section S99

-Paragraph 2

-Subparagraph (SX 210.12-17)

-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 6

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 20

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.(a),6)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Name:	us-gaap_ReinsuranceRecoverables
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Percentage of total reinsurance recoverables.

No definition available.

Name:	us-gaap_ReinsuranceRecoverablesPercentageOfTotal
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Stated amount that is the upper retention limit per entity policy.

No definition available.

Name:	us-gaap_ReinsuranceRetentionPolicyAmountRetained
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	us-gaap_CededCreditRiskAxis=all_CatastropheReinsuranceFirstThroughFifthLayersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_CededCreditRiskAxis=all_ExcessCatastropheReinsuranceAgreementBufferLayerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_CededCreditRiskAxis=all_ExcessCatastropheReinsuranceAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_CededCreditRiskAxis=all_FloridaExcessCatastropheReinsuranceAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_CededCreditRiskAxis=all_PerOccurrenceExcessCatastropheReinsuranceAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_CededCreditRiskAxis=all_PropertyClaimsServicesClassBExcessCatastropheReinsuranceAgreementCoverageWithPortionOfTenthLayerMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_CededCreditRiskAxis=all_PropertyClaimsServicesClassCExcessCatastropheReinsuranceAgreementCoverageWithPortionOfNinthLayerMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_CededCreditRiskAxis=all_PropertyClaimsServicesClassDExcessCatastropheReinsuranceAgreementCoverageWithPortionOfSeventhLayerMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_IncomeStatementLocationAxis=all_InterestCreditedToContractholderFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeStatementLocationAxis=all_LifeAndAnnuityContractBenefitsMember
Namespace Prefix:
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