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Derivative Financial Instruments - OTC derivatives counterparty credit exposure by counterparty credit rating (Details) $ in Millions | Jun. 30, 2018 USD ($) counter-party | Dec. 31, 2017 USD ($) counter-party
--- | --- | ---
Credit Derivatives |  |
Number of counter- parties | counter-party | 5 | 4
Notional amount | $ 1,762 | $ 108
Credit exposure | 16 | 4
Exposure, net of collateral | $ 1 | $ 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 | 0 | 3
Notional amount | $ 0 | $ 90
Credit exposure | 0 | 3
Exposure, net of collateral | $ 0 | $ 1
A- |  |
Credit Derivatives |  |
Number of counter- parties | counter-party | 2 | 0
Notional amount | $ 34 | $ 0
Credit exposure | 2 | 0
Exposure, net of collateral | $ 0 | $ 0
BBB plus |  |
Credit Derivatives |  |
Number of counter- parties | counter-party | 2 | 0
Notional amount | $ 1,718 | $ 0
Credit exposure | 14 | 0
Exposure, net of collateral | $ 1 | $ 0
BBB |  |
Credit Derivatives |  |
Number of counter- parties | counter-party | 1 | 0
Notional amount | $ 10 | $ 0
Credit exposure | 0 | 0
Exposure, net of collateral | $ 0 | $ 0

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- 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

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- 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

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- 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

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