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Supplemental Cash Flow Information - Activities resulting from management of proceeds (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Net change in proceeds managed |  |
Net change in short-term investments | $ (579) | $ 211
Operating cash flow (used) provided | (579) | 211
Net change in cash | 12 | (6)
Net change in proceeds managed | (567) | 205
Change in Liabilities for Collateral [Roll Forward] |  |
Liabilities for collateral, beginning of period | (914) | (1,298)
Liabilities for collateral, end of period | (1,481) | (1,093)
Operating cash flow provided (used) | $ 567 | $ (205)

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- Definition Change in Liabilities for Collateral [Roll Forward] + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The net operating cash flow provided by (used in) the net change in liabilities for collateral. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The net operating cash flow provided or used related to collateral received in conjunction with the entity's securities lending and over-the-counter derivatives. + References No definition available. + Details
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Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The net change in cash from the proceeds managed related to collateral received in conjunction with the entity's securities lending and over-the-counter derivatives. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- References No definition available. + Details
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- Definition The net change in the proceeds managed related to collateral received in conjunction with the entity's securities lending and over-the-counter derivatives. + References No definition available. + Details
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Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
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- Definition The net change in short-term investments from the proceeds managed related to collateral received in conjunction with the entity's securities lending and over-the-counter derivatives. + References No definition available. + Details
Name: | all_NetChangeInShortTermInvestmentsOfProceedsManagedCollateral
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The liability to return cash and securities received as collateral in conjunction with securities lending and over-the-counter derivatives. + References No definition available. + Details
Name: | all_ObligationToReturnCollateralSecuritiesLendingAndDerivatives
Namespace Prefix: | all_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant