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Supplemental Cash Flow Information - Activities resulting from management of proceeds (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Net change in proceeds managed |  |
Net change in fixed income securities | $ 0 | $ 80
Net change in short-term investments | 314 | (709)
Operating cash flow provided (used) | 314 | (629)
Net change in cash | (6) | 0
Net change in proceeds managed | 308 | (629)
Change in Liabilities for Collateral [Roll Forward] |  |
Liabilities for collateral, beginning of period | (1,829) | (1,458)
Liabilities for collateral, end of period | (1,521) | (2,087)
Operating cash flow (used) provided | $ (308) | $ 629

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- Definition Change in Liabilities for Collateral [Roll Forward] + References No definition available. + Details
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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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- 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
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- Definition Net Change in Fixed Income Term Investments of Proceeds Managed Collateral + References No definition available. + Details
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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
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