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Supplemental Cash Flow Information (Tables) | 9 Months Ended
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Sep. 30, 2022
Supplemental Cash Flow Information [Abstract] |
Schedule of supplemental cash flow information from collateralized securities received | The accompanying cash flows are included in cash flows from operating activities in the Condensed Consolidated Statements of Cash Flows along with the activities resulting from management of the proceeds, as follows:
($ in millions) |  | Nine months ended September 30,
| 2022 |  | 2021
Net change in proceeds managed |  |  |  |
Net change in fixed income securities |  | $ | (473) |  |  | $ | — |
Net change in short-term investments |  | (285) |  |  | (579) |
Operating cash flow (used) |  | (758) |  |  | (579) |
Net change in cash |  | 1 |  |  | 12 |
Net change in proceeds managed |  | $ | (757) |  |  | $ | (567) |
Cash flows from operating activities |  |  |  |
Net change in liabilities |  |  |  |
Liabilities for collateral, beginning of period |  | $ | (1,444) |  |  | $ | (914) |
Liabilities for collateral, end of period |  | (2,201) |  |  | (1,481) |
Operating cash flow provided |  | $ | 757 |  |  | $ | 567 |

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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