XML 173 R126.htm IDEA: XBRL DOCUMENT
v3.25.4

Reserve for Property and Casualty Insurance Claims and Claims Expense - Schedule of Incurred Claims, Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Recoverables (Details) claim in Thousands, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2025 USD ($) claim | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Auto insurance - liability coverage |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | $ 70,150 |  |  |  |
Prior year reserve reestimates | (1,520) |  |  |  |
Total prior year reserve reestimates | (1,624) |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | 50,019 |  |  |  |
All outstanding liabilities before 2021, net of recoverables | 1,390 |  |  |  |
Liabilities for claims and claim adjustment expenses, net of recoverables | 21,521 |  |  |  |
Auto insurance - liability coverage | Accident Year 2021 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 11,119 | $ 11,291 | $ 11,236 | $ 10,917 | $ 10,468
Prior year reserve reestimates | (172) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 559 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 2,440 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 10,560 | 10,105 | 9,157 | 7,341 | 3,574
Auto insurance - liability coverage | Accident Year 2022 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 13,293 | 13,565 | 13,307 | 13,308 | 0
Prior year reserve reestimates | (272) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 1,254 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 2,612 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 12,039 | 11,087 | 9,098 | 4,466 | 0
Auto insurance - liability coverage | Accident Year 2023 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 14,452 | 14,817 | 15,357 | 0 | 0
Prior year reserve reestimates | (365) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 2,547 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 2,602 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 11,905 | 9,875 | 5,094 | 0 | 0
Auto insurance - liability coverage | Accident Year 2024 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 15,191 | 15,902 | 0 | 0 | 0
Prior year reserve reestimates | (711) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 5,136 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 2,463 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 10,055 | 5,211 | 0 | 0 | 0
Auto insurance - liability coverage | Accident Year 2025 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 16,095 | 0 | 0 | 0 | 0
IBNR reserves plus expected development on reported claims | $ 10,635 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 2,403 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 5,460 | 0 | 0 | 0 | 0
Auto insurance - liability coverage | Prior year reserve reestimates for pre-2021 accident years |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Total prior year reserve reestimates | (34) |  |  |  |
Auto insurance - liability coverage | Prior year reserve reestimates for ULAE |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Total prior year reserve reestimates | (70) |  |  |  |
Auto insurance - liability coverage | Other |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Total prior year reserve reestimates | 0 |  |  |  |
Auto insurance - physical damage coverage |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 41,388 |  |  |  |
Prior year reserve reestimates | (238) |  |  |  |
Total prior year reserve reestimates | (256) |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | 40,802 |  |  |  |
All outstanding liabilities before 2021, net of recoverables | 11 |  |  |  |
Liabilities for claims and claim adjustment expenses, net of recoverables | 597 |  |  |  |
Auto insurance - physical damage coverage | Accident Year 2021 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 7,230 | 7,230 | 7,225 | 7,264 | 7,236
Prior year reserve reestimates | 0 |  |  |  |
IBNR reserves plus expected development on reported claims | $ 3 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 4,633 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 7,227 | 7,229 | 7,250 | 7,306 | 6,803
Auto insurance - physical damage coverage | Accident Year 2022 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 9,052 | 9,052 | 9,011 | 9,324 | 0
Prior year reserve reestimates | 0 |  |  |  |
IBNR reserves plus expected development on reported claims | $ 6 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 4,979 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 9,046 | 9,059 | 9,101 | 8,264 | 0
Auto insurance - physical damage coverage | Accident Year 2023 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 9,072 | 9,099 | 9,441 | 0 | 0
Prior year reserve reestimates | (27) |  |  |  |
IBNR reserves plus expected development on reported claims | $ (7) |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 4,807 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 9,079 | 9,104 | 8,498 | 0 | 0
Auto insurance - physical damage coverage | Accident Year 2024 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 8,337 | 8,548 | 0 | 0 | 0
Prior year reserve reestimates | (211) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 8 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 4,385 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 8,329 | 7,826 | 0 | 0 | 0
Auto insurance - physical damage coverage | Accident Year 2025 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 7,697 | 0 | 0 | 0 | 0
IBNR reserves plus expected development on reported claims | $ 576 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 3,830 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 7,121 | 0 | 0 | 0 | 0
Auto insurance - physical damage coverage | Prior year reserve reestimates for pre-2021 accident years |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Total prior year reserve reestimates | (8) |  |  |  |
Auto insurance - physical damage coverage | Prior year reserve reestimates for ULAE |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Total prior year reserve reestimates | (10) |  |  |  |
Auto insurance - physical damage coverage | Other |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Total prior year reserve reestimates | 0 |  |  |  |
Homeowners |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 39,137 |  |  |  |
Prior year reserve reestimates | (77) |  |  |  |
Total prior year reserve reestimates | (16) |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | 35,168 |  |  |  |
All outstanding liabilities before 2021, net of recoverables | 153 |  |  |  |
Liabilities for claims and claim adjustment expenses, net of recoverables | 4,122 |  |  |  |
Homeowners | Accident Year 2021 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 6,510 | 6,563 | 6,522 | 6,465 | 6,318
Prior year reserve reestimates | (53) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 55 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 999 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 6,455 | 6,409 | 6,294 | 6,060 | 4,464
Homeowners | Accident Year 2022 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 6,516 | 6,488 | 6,515 | 6,562 | 0
Prior year reserve reestimates | 28 |  |  |  |
IBNR reserves plus expected development on reported claims | $ 169 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 795 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 6,347 | 6,231 | 5,961 | 3,910 | 0
Homeowners | Accident Year 2023 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 8,525 | 8,626 | 9,097 | 0 | 0
Prior year reserve reestimates | (101) |  |  |  |
IBNR reserves plus expected development on reported claims | $ 320 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 1,033 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 8,205 | 7,830 | 5,798 | 0 | 0
Homeowners | Accident Year 2024 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 8,657 | 8,608 | 0 | 0 | 0
Prior year reserve reestimates | 49 |  |  |  |
IBNR reserves plus expected development on reported claims | $ 710 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 1,091 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 7,947 | 5,753 | 0 | 0 | 0
Homeowners | Accident Year 2025 |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Incurred claims and allocated claim adjustment expenses, net of recoverables | 8,929 | 0 | 0 | 0 | 0
IBNR reserves plus expected development on reported claims | $ 2,715 |  |  |  |
Cumulative number of reported claims (in thousands) | claim | 819 |  |  |  |
Cumulative paid claims and allocated claims adjustment expenses, net of recoverables | $ 6,214 | $ 0 | $ 0 | $ 0 | $ 0
Homeowners | Prior year reserve reestimates for pre-2021 accident years |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Total prior year reserve reestimates | 27 |  |  |  |
Homeowners | Prior year reserve reestimates for ULAE |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Total prior year reserve reestimates | 34 |  |  |  |
Homeowners | Other |  |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |  |
Total prior year reserve reestimates | $ 0 |  |  |  |

X
- Definition Prior Year Reserve Estimates Increase (Decrease) + References No definition available. + Details
Name: | all_PriorYearReserveEstimatesIncreaseDecrease
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Short Term Duration Insurance Contracts, Prior Year Reserve Estimates Increase (Decrease) + References No definition available. + Details
Name: | all_ShortTermDurationInsuranceContractsPriorYearReserveEstimatesIncreaseDecrease
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 + Details
Name: | us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4B + Details
Name: | us-gaap_ShortdurationInsuranceContractsCumulativePaidClaimsAndAllocatedClaimAdjustmentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4E Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4D + Details
Name: | us-gaap_ShortdurationInsuranceContractsIncurredButNotReportedIbnrClaimsLiabilityNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4B + Details
Name: | us-gaap_ShortdurationInsuranceContractsIncurredClaimsAndAllocatedClaimAdjustmentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4B Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4C + Details
Name: | us-gaap_ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4B Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E + Details
Name: | us-gaap_ShortdurationInsuranceContractsLiabilityForUnpaidClaimsAndAllocatedClaimAdjustmentExpenseNetNotSeparatelyPresented
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cumulative number of reported claims for short-duration insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4D + Details
Name: | us-gaap_ShortdurationInsuranceContractsNumberOfReportedClaims
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_ProductOrServiceAxis=all_AutoInsuranceLiabilityCoverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=us-gaap_ShortDurationInsuranceContractAccidentYear2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=us-gaap_ShortDurationInsuranceContractAccidentYear2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=us-gaap_ShortDurationInsuranceContractAccidentYear2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=us-gaap_ShortDurationInsuranceContractAccidentYear2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=us-gaap_ShortDurationInsuranceContractAccidentYear2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=all_ShortDurationInsuranceContractsAccidentYearBefore2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=all_UnallocatedLossAdjustmentExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | all_ReserveReestimatesAxis=all_OtherReserveReestimatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=all_AutoInsurancePhysicalDamageCoverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=all_HomeOwnersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |