- Definition

The current maximum estimated amount of an assessment if the capital balance of a state insurance facility falls below a specified level.

+ References

No definition available.

+ Details

Name:	all_AssessmentEstimatedMaximumAmount
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the maximum possible assessment amount by a state insurance facility in which the entity participates.

+ References

No definition available.

+ Details

Name:	all_MaximumPossibleAssessmentAmount
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the entity's share in a state insurance facility.

+ References

No definition available.

+ Details

Name:	all_PercentageOfEntityInterest
Namespace Prefix:	all_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Policy Holder Surcharge

+ References

No definition available.

+ Details

Name:	all_PolicyHolderSurcharge
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Proceeds of Revenue Bonds

+ References

No definition available.

+ Details

Name:	all_ProceedsofRevenueBonds
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the projected aggregate claim paying capacity of a state insurance facility in which the entity participates.

+ References

No definition available.

+ Details

Name:	all_ProjectedAggregateClaimPayingCapacity
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the capital balance of a state insurance facility in which the entity participates.

+ References

No definition available.

+ Details

Name:	all_StateFacilityCapitalBalance
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The capital balance of a state insurance facility, below which an assessment is triggered.

+ References

No definition available.

+ Details

Name:	all_StateFacilityCapitalBalanceThreshold
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents funding obtainable by a state insurance facility from an existing reinsurance layer in the event that losses cause a deficit.

+ References

No definition available.

+ Details

Name:	all_StateFacilityExistingReinsuranceLayer
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The capital balance level for a state insurance facility that may be restored through assessments.

+ References

No definition available.

+ Details

Name:	all_StateFacilityMaximumRestoredCapitalBalance
Namespace Prefix:	all_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

No definition available.

+ Details

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

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=all_CaliforniaEarthquakeAuthorityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments, Guarantees and Contingent Liabilities - California Earthquake Authority (Details) - California Earthquake Authority - USD ($) $ in Millions	Oct. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Loss Contingencies
CEA capital balance	$ 5,700
Proceeds of revenue bonds	1,700
CEA existing reinsurance layer	9,500
Policy holder surcharge	1,000
Current estimated maximum CEA assessment	1,700
CEA capital balance threshold	350
CEA capital balance to be restored	350
Projected aggregate claim paying capacity	$ 19,600
Share of the CEA (as a percent)			8.70%
Maximum possible assessment		$ 144