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Supplemental Cash Flow Information (Tables) | 3 Months Ended
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Mar. 31, 2021
Supplemental Cash Flow Information [Abstract] |
Schedule of supplemental cash flow information from collateralized securities received |
($ in millions) |  | Three months ended March 31,
| 2021 |  | 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 |  |  | — |
Net change in proceeds managed |  | $ | (182) |  |  | $ | 370 |
Cash flows from operating activities |  |  |  |
Net change in liabilities |  |  |  |
Liabilities for collateral, beginning of period |  | $ | (914) |  |  | $ | (1,298) |
Liabilities for collateral, end of period |  | (1,096) |  |  | (928) |
Operating cash flow provided (used) |  | $ | 182 |  |  | $ | (370) |

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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
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Namespace Prefix: | all_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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