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Derivative Financial Instruments and Off-balance sheet Financial Instruments - OTC derivatives counterparty credit exposure (Details) $ in Millions | Dec. 31, 2018 USD ($) counter-party | Dec. 31, 2017 USD ($) counter-party
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Derivative Financial Instruments and Off-balance sheet Financial Instruments |  |
Cash and securities pledged as collateral by counterparties | $ 21 |
Securities pledged as collateral to counterparties | 4 |
Collateral posted under MNAs, credit-risk-contingent provisions in a liability position | 2 | $ 6
Collateral already posted, aggregate fair value, without credit-risk-contingent features | $ 2 |
Credit Derivatives |  |
Number of counter-parties | counter-party | 5 | 4
Notional amount | $ 764 | $ 108
Credit exposure | 20 | 4
Exposure, net of collateral | 1 | 1
Gross liability fair value of contracts containing credit-risk-contingent features | 11 | 28
Gross asset fair value of contracts containing credit-risk-contingent features and subject to MNAs | (5) | (17)
Collateral posted under MNAs for contracts containing credit-risk-contingent features | (2) | (6)
Maximum amount of additional exposure for contracts with credit-risk-contingent features if all features were triggered concurrently | $ 4 | $ 5
AA– |  |
Credit Derivatives |  |
Number of counter-parties | counter-party | 0 | 1
Notional amount | $ 0 | $ 18
Credit exposure | 0 | 1
Exposure, net of collateral | $ 0 | $ 0
A plus |  |
Credit Derivatives |  |
Number of counter-parties | counter-party | 3 | 3
Notional amount | $ 643 | $ 90
Credit exposure | 19 | 3
Exposure, net of collateral | $ 1 | $ 1
A |  |
Credit Derivatives |  |
Number of counter-parties | counter-party | 2 | 0
Notional amount | $ 121 | $ 0
Credit exposure | 1 | 0
Exposure, net of collateral | $ 0 | $ 0

X
- Definition This element represents cash and securities pledged as collateral from counterparties. + References No definition available. + Details
Name: | all_CashAndSecuritiesPledgedAsCollateralFromCounterparties
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Collateral Already Posted, Aggregate Fair Value, Without Credit-Risk-Contingent Features + References No definition available. + Details
Name: | all_CollateralAlreadyPostedAggregateFairValueWithoutCreditRiskContingentFeatures
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of credit exposure by counterparties related to derivative contracts. + References No definition available. + Details
Name: | all_CounterpartyCreditExposure
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of credit exposure by counterparties net of collateral received, related to derivative contracts. + References No definition available. + Details
Name: | all_CreditDerivativeExposureNetOfCollateral
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Fair value of derivative asset, presented on a gross basis containing credit risk contingent features and which is subject to master netting arrangements. + References No definition available. + Details
Name: | all_DerivativeGrossAssetFairValueWithCreditRiskContingentFeatures
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of derivative liabilities, presented on a gross basis containing credit risk contingent features. + References No definition available. + Details
Name: | all_DerivativeGrossLiabilityFairValueWithCreditRiskContingentFeatures
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The notional amount of derivative contracts for which the entity has counterparty credit exposure. + References No definition available. + Details
Name: | all_NotionalAmountOfCounterpartyCreditExposure
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of counterparties to which the entity has counterparty credit exposure related to derivative contracts. + References No definition available. + Details
Name: | all_NumberOfCounterparties
Namespace Prefix: | all_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents securities pledged to counterparties as collateral for credit exposure. + References No definition available. + Details
Name: | all_SecuritiesPledgedAsCollateralToCounterparties
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
Name: | us-gaap_CollateralAlreadyPostedAggregateFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsARatingMember
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