XML 152 R107.htm IDEA: XBRL DOCUMENT
v3.20.4

Reserve for Property and Casualty Insurance Claims and Claims Expense - Reconciliation of total claims and claims expense incurred and paid by coverage (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Increase (decrease) in claims and claims expense |  |  |
Incurred | $ 22,001 | $ 23,976 | $ 22,778
Paid | (22,224) | (23,444) | (22,364)
Claims incurred and paid from before 2016 |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | (32) |  |
Paid | (423) |  |
Auto insurance - liability coverage |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 7,629 |  |
Paid | (7,939) |  |
Auto insurance - physical damage coverage |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 4,817 |  |
Paid | (4,716) |  |
Homeowners |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 4,889 |  |
Paid | (4,731) |  |
Total auto and homeowners insurance |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 17,335 |  |
Paid | (17,386) |  |
Other personal lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 1,015 |  |
Paid | (1,007) |  |
Commercial lines |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 585 |  |
Paid | (463) |  |
Protection Services |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 319 |  |
Paid | (326) |  |
Unallocated loss adjustment expenses (“ULAE”) |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 2,681 |  |
Paid | (2,590) |  |
Other |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | (34) |  |
Paid | 59 |  |
Discontinued Lines and Coverages |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | 132 |  |
Paid | (88) |  |
Catastrophe losses |  |  |
Increase (decrease) in claims and claims expense |  |  |
Incurred | $ 2,810 | $ 2,560 | $ 2,860

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 and costs incurred in the claim settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
Name: | us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 + Details
Name: | us-gaap_PaymentsForLossesAndLossAdjustmentExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ShortdurationInsuranceContractsAccidentYearAxis=all_ShortDurationInsuranceContractsAccidentYearBefore2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=all_AutoInsuranceLiabilityCoverageMember
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: |

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

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

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

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=all_DiscontinuedLinesAndCoveragesMember
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: |