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Derivative Financial Instruments and Off-balance Sheet Financial Instruments - Schedule of Contractual Amounts of Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Derivative Financial Instruments and Off-balance sheet Financial Instruments
Commitments to invest in limited partnership interests	$ 3,244	$ 3,345
Private placement commitments	74	29
Other loan commitments	$ 14	$ 16

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- Definition

This element represents commitments to acquire financial interests or instruments, to allow for additional participation in certain limited partnership investments. Because the equity investments in the limited partnerships are not actively traded, it is not practical to estimate the fair value of these commitments.

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No definition available.

+ Details

Name:	all_CommitmentsToInvestInLimitedPartnershipInterests
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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- Definition

This element represents other loan commitments to fund loans to a borrower provided there is no violation of any condition in the contract. These commitments have predetermined interest rates and fixed or varying expiration dates or other termination clauses. The fair value of these commitments is insignificant.

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No definition available.

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Name:	all_OtherLoanCommitments
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

This element represents conditional commitments to purchase private placement debt and equity securities at a specified future date. The fair value of these commitments generally cannot be estimated on the date the commitment is made as the terms and conditions of the underlying private placement securities are not finalized at that point of time.

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No definition available.

+ Details

Name:	all_PrivatePlacementCommitments
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant