XML 120 R101.htm IDEA: XBRL DOCUMENT
v3.23.1

Reinsurance and Indemnification - Claims expense, life contract benefits and interest credited to contractholder funds (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Property and casualty insurance claims and claims expense |  |
Reductions to costs and expenses due to reinsurance ceded amounts |  |
Ceded losses incurred | $ (320) | $ (109)
Ceded losses | 58 |
Reinstatement premiums | 18 |
Accident, health and other policy benefits |  |
Reductions to costs and expenses due to reinsurance ceded amounts |  |
Ceded losses incurred | $ (8) | $ (7)

X
- Definition Ceded Income (Losses) + References No definition available. + Details
Name: | all_CededIncomeLosses
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reinstatement Premiums + References No definition available. + Details
Name: | all_ReinstatementPremiums
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of reinsurance ceded under various contracts. + References No definition available. + Details
Name: | all_ReinsuranceCededAmount
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=all_PropertyLiabilityInsuranceClaimsAndClaimsExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=all_AccidentHealthAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |