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Derivative Financial Instruments - OTC derivatives counterparty credit exposure by counterparty credit rating (Details) $ in Millions | Sep. 30, 2018 USD ($) counter-party | Dec. 31, 2017 USD ($) counter-party
--- | --- | ---
Credit Derivatives |  |
Number of counter- parties | counter-party | 5 | 4
Notional amount | $ 669 | $ 108
Credit exposure | 11 | 4
Exposure, net of collateral | $ 3 | $ 1
AA- |  |
Credit Derivatives |  |
Number of counter- parties | counter-party | 0 | 1
Notional amount | $ 0 | $ 18
Credit exposure | 0 | 1
Exposure, net of collateral | $ 0 | $ 0
A plus |  |
Credit Derivatives |  |
Number of counter- parties | counter-party | 4 | 3
Notional amount | $ 659 | $ 90
Credit exposure | 11 | 3
Exposure, net of collateral | $ 3 | $ 1
A |  |
Credit Derivatives |  |
Number of counter- parties | counter-party | 1 | 0
Notional amount | $ 10 | $ 0
Credit exposure | 0 | 0
Exposure, net of collateral | $ 0 | $ 0

X
- Definition The amount of credit exposure by counterparties related to derivative contracts. + References No definition available. + Details
Name: | all_CounterpartyCreditExposure
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of credit exposure by counterparties net of collateral received, related to derivative contracts. + References No definition available. + Details
Name: | all_CreditDerivativeExposureNetOfCollateral
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The notional amount of derivative contracts for which the entity has counterparty credit exposure. + References No definition available. + Details
Name: | all_NotionalAmountOfCounterpartyCreditExposure
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of counterparties to which the entity has counterparty credit exposure related to derivative contracts. + References No definition available. + Details
Name: | all_NumberOfCounterparties
Namespace Prefix: | all_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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_CreditDerivativesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsAAMinusRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsAPlusRatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CreditRatingStandardPoorsAxis=srt_StandardPoorsARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |