XML 99 R78.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Guarantees and Contingent Liabilities (Details) |  | 6 Months Ended | 28 Months Ended |
--- | --- | --- | --- | ---
Jan. 30, 2018 judgment plaintiff | Jun. 30, 2018 USD ($) appeal | Dec. 31, 2003 case | May 08, 2018 USD ($)
Proceedings: |  |  |  |
Number of appeals | appeal |  | 3 |  |
Number of class action cases | case |  |  | 3 |
Loss contingency, number of summary judgments | judgment | 2 |  |  |
Minimum |  |  |  |
Proceedings: |  |  |  |
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued |  | $ 0 |  |
Maximum |  |  |  |
Proceedings: |  |  |  |
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued |  | $ 145,000,000 |  |
Judicial Ruling |  |  |  |
Proceedings: |  |  |  |
Loss contingency, number of plaintiffs | plaintiff | 27 |  |  |
Texas Windstorm Insurance Association |  |  |  |
Proceedings: |  |  |  |
Loss contingency, loss accrual |  |  |  | $ 37,000,000

X
- References No definition available. + Details
Name: | all_ContingentLiabilitiesAbstract
Namespace Prefix: | all_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loss Contingency, Number Of Summary Judgments + References No definition available. + Details
Name: | all_LossContingencyNumberOfSummaryJudgments
Namespace Prefix: | all_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Estimate of the reasonably possible pretax loss exposure in excess of the amount accrued for the entity's lawsuits, regulatory inquiries and other legal proceedings. + References No definition available. + Details
Name: | all_LossContingencyReasonablyPossibleAdditionalLossesPretaxEstimate
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number Of Appeals + References No definition available. + Details
Name: | all_NumberOfAppeals
Namespace Prefix: | all_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
Name: | us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationStatusAxis=us-gaap_JudicialRulingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=all_TexasWindstormInsuranceAssociationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |