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Derivative Financial Instruments and Off-balance sheet Financial Instruments - OTC derivatives counterparty credit exposure (Details) $ in Millions | Dec. 31, 2020 USD ($) counter-party | Dec. 31, 2019 USD ($) counter-party
--- | --- | ---
Credit Derivatives |  |
Number of counter-parties | counter-party | 3 | 6
Notional amount | $ 280 | $ 868
Credit exposure | 7 | 29
Exposure, net of collateral | 0 | 0
Gross liability fair value of contracts containing credit-risk-contingent features | 27 | 16
Gross asset fair value of contracts containing credit-risk-contingent features and subject to MNAs | (9) | (11)
Collateral posted under MNAs for contracts containing credit-risk-contingent features | (17) | (3)
Maximum amount of additional exposure for contracts with credit-risk-contingent features if all features were triggered concurrently | $ 1 | $ 2
A plus |  |
Credit Derivatives |  |
Number of counter-parties | counter-party | 3 | 6
Notional amount | $ 280 | $ 868
Credit exposure | 7 | 29
Exposure, net of collateral | $ 0 | $ 0

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

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- Definition The amount of credit exposure by counterparties net of collateral received, related to derivative contracts. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- 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
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Namespace Prefix: | all_
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- Definition Fair value of derivative liabilities, presented on a gross basis containing credit risk contingent features. + References No definition available. + Details
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Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The notional amount of derivative contracts for which the entity has counterparty credit exposure. + References No definition available. + Details
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- Definition The number of counterparties to which the entity has counterparty credit exposure related to derivative contracts. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- 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=121590274&loc=SL5624258-113959 + Details
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- 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=121590274&loc=SL5624258-113959 + Details
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- 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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- Details
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