The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

No definition available.

+ Details

Name:	us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480078/944-80-55-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480078/944-80-55-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B

+ Details

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

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	all_MortgageAcquisitionPeriodAxis=all_Acquisition2020AndPriorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	all_MortgageAcquisitionPeriodAxis=all_Acquisition2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	all_MortgageAcquisitionPeriodAxis=all_Acquisition2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	all_MortgageAcquisitionPeriodAxis=all_Acquisition2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	all_MortgageAcquisitionPeriodAxis=all_Acquisition2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	all_MortgageAcquisitionPeriodAxis=all_AcquisitionCurrentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=all_DebtServiceCoverageRatioBelow1.0To1.25Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=all_DebtServiceCoverageRatioBelow1.26To1.50Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=all_DebtServiceCoverageRatioAbove1.50Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Investments - Schedule of Mortgage Loans Amortized Cost by Debt Service Coverage Ratio Distribution and Year of Origination (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, net	$ 770	$ 784
Mortgage loans
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	702	735
Allowance	(12)	(12)
Amortized cost, net	690	723
Mortgage loans \| 2020 and prior
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	277
Mortgage loans \| 2021
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	165
Mortgage loans \| 2022
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	90
Mortgage loans \| 2023
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	119
Mortgage loans \| 2024
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	51
Mortgage loans \| 2025
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
1.0 - 1.25 \| Mortgage loans
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	139	137
1.0 - 1.25 \| Mortgage loans \| 2020 and prior
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	59
1.0 - 1.25 \| Mortgage loans \| 2021
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
1.0 - 1.25 \| Mortgage loans \| 2022
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	18
1.0 - 1.25 \| Mortgage loans \| 2023
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	25
1.0 - 1.25 \| Mortgage loans \| 2024
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	37
1.0 - 1.25 \| Mortgage loans \| 2025
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
1.26 - 1.50 \| Mortgage loans
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	105	105
1.26 - 1.50 \| Mortgage loans \| 2020 and prior
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	56
1.26 - 1.50 \| Mortgage loans \| 2021
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
1.26 - 1.50 \| Mortgage loans \| 2022
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	30
1.26 - 1.50 \| Mortgage loans \| 2023
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	19
1.26 - 1.50 \| Mortgage loans \| 2024
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
1.26 - 1.50 \| Mortgage loans \| 2025
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
Above 1.50 \| Mortgage loans
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	458	$ 493
Above 1.50 \| Mortgage loans \| 2020 and prior
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	162
Above 1.50 \| Mortgage loans \| 2021
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	165
Above 1.50 \| Mortgage loans \| 2022
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	42
Above 1.50 \| Mortgage loans \| 2023
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	75
Above 1.50 \| Mortgage loans \| 2024
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	14
Above 1.50 \| Mortgage loans \| 2025
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	$ 0