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Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Contractholder Funds Activity (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Contractholder funds activity |  |
Beginning balance | $ 888 | $ 879
Deposits | 98 | 99
Interest credited | 25 | 25
Benefits | (9) | (8)
Surrenders and partial withdrawals | (17) | (15)
Contract charges | (89) | (90)
Other adjustments | (5) | (6)
Ending balance | 891 | 884
Components of contractholder funds | $ 891 | $ 884
Weighted-average crediting rate | 4.19% | 4.26%
Net amount at risk | $ 10,927 | $ 11,550
Cash surrender value | 734 | 728
Interest-sensitive life insurance |  |
Contractholder funds activity |  |
Ending balance | 850 | 837
Components of contractholder funds | 850 | 837
Fixed annuities |  |
Contractholder funds activity |  |
Ending balance | 41 | 47
Components of contractholder funds | $ 41 | $ 47

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- Definition Decrease in the liability for policyholder contract deposits resulting from benefits paid out of contract holder funds. + References No definition available. + Details
Name: | all_BenefitsPaidFromContractHolderFunds
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition An amount that an insurer deducts from a contract holder's account, as compensation for services rendered. + References No definition available. + Details
Name: | all_ContractCharges
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase in the liability for policyholder contract deposits resulting from amounts received during the period from the insured. + References No definition available. + Details
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Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase in the liability for policyholder contract deposits resulting from interest credited during the period by the insurer to policy owner accounts. + References No definition available. + Details
Name: | all_InterestToContractHolderFunds
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Movement in Policyholder Contract Deposits + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Other adjustments during the period to the liability for policyholder contract deposits, not specified elsewhere in the taxonomy. + References No definition available. + Details
Name: | all_PolicyholderContractDepositsAdjustmentsOther
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Decrease in the liability for policyholder contract deposits resulting from surrenders and partial withdrawals out of contract holder funds. + References No definition available. + Details
Name: | all_SurrendersAndPartialWithdrawalsFromContractHolderFunds
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of cash to be paid to policyholder upon termination and surrender of long-duration contract issued by insurance entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F + Details
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- Definition Amount of guaranteed benefit in excess of current account balance of policyholder account balance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F + Details
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- Definition Weighted-average crediting rate for liability for policyholder account balance, calculated at a point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F + Details
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- Definition Amount of liability due to policyholder for deposit held under long-duration contract issued by insurance entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 25 -Paragraph 14 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479250/944-40-25-14 + Details
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- Details
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- Details
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Period Type: |