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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2025
Supplemental Cash Flow Information [Abstract] |
Schedule of Supplemental Cash Flow Information | The accompanying cash flows are included in cash flows from operating activities in the Consolidated Statements of Cash Flows along with the activities resulting from management of the proceeds, as follows:
|  | For the years ended December 31,
($ in millions) |  | 2025 |  | 2024 |  | 2023
Cash flows from operating activities |  |  |  |  |  |
Net change in proceeds managed |  |  |  |  |  |
Net change in fixed income securities |  | $ | (228) |  |  | $ | (4) |  |  | $ | 259 |
Net change in short-term investments |  | 335 |  |  | (146) |  |  | (139) |
Operating cash flow provided (used) |  | $ | 107 |  |  | $ | (150) |  |  | $ | 120 |
Net change in liabilities |  |  |  |  |  |
Liabilities for collateral, beginning of year |  | $ | (2,041) |  |  | $ | (1,891) |  |  | $ | (2,011) |
Liabilities for collateral, end of year |  | (1,934) |  |  | (2,041) |  |  | (1,891) |
Operating cash flow (used) provided |  | $ | (107) |  |  | $ | 150 |  |  | $ | (120) |

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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