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Reserve for Future Policy Benefits and Contractholder Funds - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Reserve for Future Policy Benefits and Contractholder Funds [Abstract] |  |
Increase (less than) in future policy benefit reserves | $ 1 | $ 1

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- Definition Reserve for Future Policy Benefits and Contractholder Funds + References No definition available. + Details
Name: | all_ReserveForFuturePolicyBenefitsAndContractholderFundsAbstract
Namespace Prefix: | all_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The change in the future policy benefit reserve balance on the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
Name: | us-gaap_IncreaseDecreaseInFuturePolicyBenefitReserves
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration