XML 104 R87.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Reserve for Property and Casualty Insurance Claims and Claims Expense - Prior year reserve reestimates included in claims and claims expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | $ 866 | $ 161 | $ 1,470 | $ (65)
Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 632 | 72 | 1,011 | 3
Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 55 | 17 | 177 | (156)
Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (5) | (66) | (14) | (83)
Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 64 | 25 | 175 | 58
Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 120 | 113 | 124 | 115
Unfavorable reestimates |  |  | 118 | 111
Protection Services |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 0 | 0 | (3) | (2)
Non-catastrophe losses |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 875 | 162 | 1,441 | 142
Non-catastrophe losses | Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 643 | 77 | 1,069 | 31
Non-catastrophe losses | Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 51 | 14 | 95 | 12
Non-catastrophe losses | Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (2) | (66) | (18) | (69)
Non-catastrophe losses | Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 63 | 24 | 174 | 55
Non-catastrophe losses | Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 120 | 113 | 124 | 115
Non-catastrophe losses | Protection Services |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 0 | 0 | (3) | (2)
Catastrophe |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (9) | (1) | 29 | (207)
Catastrophe | Nationwide Aggregate Reinsurance Program |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years |  | 40 |  | 240
Catastrophe | Auto |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (11) | (5) | (58) | (28)
Catastrophe | Homeowners |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 4 | 3 | 82 | (168)
Catastrophe | Other personal lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | (3) | 0 | 4 | (14)
Catastrophe | Commercial lines |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 1 | 1 | 1 | 3
Catastrophe | Run-off Property-Liability |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | 0 | 0 | 0 | 0
Catastrophe | Protection Services |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years | $ 0 | $ 0 | $ 0 | 0
Fire | Southern California Edison |  |  |  |
Increase (decrease) in claims and claims expense |  |  |  |
Prior years |  |  |  | $ 110

X
- Definition Prior Year Claims and Claims Adjustment Expense, Unfavorable Reestimates + References No definition available. + Details
Name: | all_PriorYearClaimsAndClaimsAdjustmentExpenseUnfavorableReestimates
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 No definition available. + Details
Name: | us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
Name: | us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_ProductOrServiceAxis=all_AutoMember
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: |

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

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

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

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

X
- Details
Name: | us-gaap_NoncatastrophicEventAxis=all_NonCatastropheReestimatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=us-gaap_CatastropheMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=all_NationwideAggregateReinsuranceProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=us-gaap_FireMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=all_SouthernCaliforniaEdisonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |