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Derivative Financial Instruments and Off-balance Sheet Financial Instruments - Schedule of OTC Derivatives Counterparty Credit Exposure by Counterparty Credit Rating (Details) $ in Millions | Mar. 31, 2025 USD ($) counter-party | Dec. 31, 2024 USD ($) counter-party
--- | --- | ---
Credit Derivatives |  |
Number of counter-parties | counter-party | 1 | 4
Notional amount | $ 0 | $ 602
Credit exposure | 0 | 20
Exposure, net of collateral | $ 0 | $ 2
AA- |  |
Credit Derivatives |  |
Number of counter-parties | counter-party | 1 | 1
Notional amount | $ 0 | $ 213
Credit exposure | 0 | 10
Exposure, net of collateral | $ 0 | $ 1
A+ |  |
Credit Derivatives |  |
Number of counter-parties | counter-party | 0 | 3
Notional amount | $ 0 | $ 389
Credit exposure | 0 | 10
Exposure, net of collateral | $ 0 | $ 1

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

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 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
Name: | us-gaap_CreditDerivativesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsAAMinusRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsAPlusRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |