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Reinsurance - Retention limits by period of policy issuance (Details) - Allstate Financial - USD ($) $ in Millions | 1 Months Ended | 33 Months Ended | 45 Months Ended | 48 Months Ended | 106 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 31, 1998 | Dec. 31, 2017 | Mar. 31, 2011 | Mar. 31, 2015 | Jun. 30, 2007
Reinsurance Retention Policy [Line Items] |  |  |  |  |
Retention level per claim | $ 1 |  | $ 5 |  | $ 2
Retention level for contracts issued to individuals age 70 and over |  |  | 3 |  |
Retention level for certain large contracts meeting specific criteria |  |  | $ 10 |  | $ 5
Single life |  |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |  |
Retention level per claim |  | $ 2 |  | $ 5 |
Retention level for contracts issued to individuals age 70 and over |  |  |  | 3 |
Retention level for certain large contracts meeting specific criteria |  |  |  | 10 |
Joint life |  |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |  |
Retention level per claim |  |  |  | 8 |
Retention level for certain large contracts meeting specific criteria |  |  |  | $ 10 |

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- Definition The retention level per claim or life above which the risk is generally ceded to a reinsurer for contracts issued to individuals age 70 and over. + References No definition available. + Details
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- Definition The retention level per claim or life above which the risk is generally ceded to a reinsurer for certain large contracts that meet specific criteria. + References No definition available. + Details
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- Definition Stated amount that is the upper retention limit per entity policy. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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