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Derivative Financial Instruments and Off-balance sheet Financial Instruments - Narrative (Details) - USD ($) | 12 Months Ended |
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Dec. 31, 2020 | Dec. 31, 2019
Derivative Financial Instruments and Off-balance sheet Financial Instruments |  |
Potential recoveries | $ 0 |
Cash and securities pledged as collateral, from counterparties | 7,000,000 |
Securities pledged as collateral to counterparties | 19,000,000 |
Collateral posted | 17,000,000 | $ 3,000,000
Margin deposits | 60,000,000 |
Margin deposit liabilities | $ 12,000,000 |

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- 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

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- References No definition available. + Details
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- Definition Margin Deposit Liabilities + References No definition available. + Details
Name: | all_MarginDepositLiabilities
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the potential amount of recoveries under sale of credit protection. + References No definition available. + Details
Name: | all_PotentialRecoveriesUnderCreditRiskDerivatives
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- 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

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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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Balance Type: | debit
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- Definition The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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