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Supplemental Cash Flow Information - Activities resulting from management of proceeds (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Net change in proceeds managed |  |
Net change in short-term investments | $ (183) | $ 370
Operating cash flow (used) provided | (183) | 370
Net change in cash | 1 | 0
Net change in proceeds managed | (182) | 370
Change in Liabilities for Collateral [Roll Forward] |  |
Liabilities for collateral, beginning of period | (914) | (1,298)
Liabilities for collateral, end of period | (1,096) | (928)
Operating cash flow provided (used) | $ 182 | $ (370)

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- Definition Change in Liabilities for Collateral [Roll Forward] + References No definition available. + Details
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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
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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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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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- 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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- 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
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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