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Derivative Financial Instruments - Fair value of instruments with credit-risk-contingent features (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Gross liability fair value of contracts containing credit-risk-contingent features | $ 7 | $ 11
Gross asset fair value of contracts containing credit-risk-contingent features and subject to MNAs | (7) | (5)
Collateral posted under MNAs for contracts containing credit-risk-contingent features | 0 | (2)
Maximum amount of additional exposure for contracts with credit-risk-contingent features if all features were triggered concurrently | $ 0 | $ 4

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- Definition Fair value of derivative asset, presented on a gross basis containing credit risk contingent features and which is subject to master netting arrangements. + References No definition available. + Details
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Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value of derivative liabilities, presented on a gross basis containing credit risk contingent features. + References No definition available. + Details
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Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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Period Type: | instant

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration