Name:	all_AccumulatedOtherComprehensiveIncomeLossRelatedToAssetsHeldForSaleNetOfTax
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for assets, before loss accrual of a disposal group, including a component of the entity (discontinued operation), to be sold or that has been disposed of through sale, as of the financial statement date.

No definition available.

Name:	all_AssetsOfDisposalGroupIncludingDiscontinuedOperationBeforeLossAccrual
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), carrying amount of accrued investment income.

No definition available.

Name:	all_DisposalGroupIncludingDiscontinuedOperationAccruedInvestmentIncome
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), carrying amount of cash and retention tax benefits.

No definition available.

Name:	all_DisposalGroupIncludingDiscontinuedOperationCashAndRetentionTaxBenefits
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), carrying amount of contractholder funds.

No definition available.

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

For the disposal group, including a component of the entity (discontinued operation), carrying amount of deferred policy acquisition costs.

No definition available.

Name:	all_DisposalGroupIncludingDiscontinuedOperationDeferredPolicyAcquisitionCosts
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), carrying amount of investments.

No definition available.

Name:	all_DisposalGroupIncludingDiscontinuedOperationInvestments
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), carrying amount of loss accrual.

No definition available.

Name:	all_DisposalGroupIncludingDiscontinuedOperationLossAccrual
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), carrying amount of reinsurance recoverables, net.

No definition available.

Name:	all_DisposalGroupIncludingDiscontinuedOperationReinsuranceRecoverablesNet
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), carrying amount of reserve for life-contingent contract benefits.

No definition available.

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

For the disposal group, including a component of the entity (discontinued operation), carrying amount of separate accounts assets.

No definition available.

Name:	all_DisposalGroupIncludingDiscontinuedOperationSeparateAccountsAssets
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

For the disposal group, including a component of the entity (discontinued operation), carrying amount of separate accounts liabilities.

No definition available.

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

For the disposal group, including a component of the entity (discontinued operation), carrying amount of unearned premiums.

No definition available.

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

The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation, net of tax effect.

No definition available.

Name:	all_DisposalGroupNotDiscontinuedOperationGainLossOnDisposalAfterTax
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the carrying amount of the investments held by trust.

No definition available.

Name:	all_InvestmentsHeldByTrust
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount classified as assets attributable to disposal group held for sale or disposed of.

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

Name:	us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount classified as deferred tax liabilities attributable to disposal group held for sale or disposed of.

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount classified as other assets attributable to disposal group held for sale or disposed of.

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

Amount classified as other liabilities attributable to disposal group held for sale or disposed of.

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228

Name:	us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
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Data Type:	xbrli:monetaryItemType
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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Name:	us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
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Data Type:	xbrli:stringItemType
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Amount classified as liabilities attributable to disposal group held for sale or disposed of.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760

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

Name:	us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationAbstract
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Data Type:	xbrli:stringItemType
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The value of all consideration given or received by the Entity in the significant acquisition or disposal.

No definition available.

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