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Supplemental Cash Flow Information (Tables) | 9 Months Ended
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Sep. 30, 2021
Supplemental Cash Flow Information [Abstract] |
Schedule of supplemental cash flow information from collateralized securities received |
($ in millions) |  | Nine months ended September 30,
| 2021 |  | 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 |
Cash flows from operating activities |  |  |  |
Net change in liabilities |  |  |  |
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 This element may be used to capture the complete disclosure pertaining to supplemental cash flow information about collateral received. + References No definition available. + Details
Name: | all_ScheduleOfSupplementalCashFlowInformationFromCollateralizedSecuritiesReceivedTableTextBlock
Namespace Prefix: | all_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration