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Derivative Financial Instruments - Schedule of Fair Value of Instruments with Credit-Risk-Contingent Features (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Gross liability fair value of contracts containing credit-risk-contingent features | $ 31 | $ 1
Gross asset fair value of contracts containing credit-risk-contingent features and subject to MNAs | (2) | (1)
Collateral posted under MNAs for contracts containing credit-risk-contingent features | (28) | 0
Maximum amount of additional exposure for contracts with credit-risk-contingent features if all features were triggered concurrently | $ 1 | $ 0

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- Definition Additional Collateral, Aggregate Fair Value, Net + References No definition available. + Details
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Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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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
Name: | all_DerivativeGrossLiabilityFairValueWithCreditRiskContingentFeatures
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 185 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-185 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4H -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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