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Commitments, Guarantees and Contingent Liabilities - Florida and Louisiana Citizens (Details) | 12 Months Ended
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Dec. 31, 2017
FL Citizens |
Loss Contingencies |
Assessment rate, percent of deficit or prior year premiums | 2.00%
Surcharge on policies, deadline for filing prior to imposing | 15 days
Emergency assessment maximum percentage of premiums subsequent years, FL OIR | 0.00%
LA Citizens |
Loss Contingencies |
Assessment rate, percent of deficit or prior year premiums | 10.00%

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- Definition Emergency Assessment Maximum Percentage of Premiums Subsequent Years, FL OIR + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The period of time prior to imposing a surcharge on policies to recoup a deficit assessment by which the insurer must file the surcharge with the regulatory agency. + References No definition available. + Details
Name: | all_PolicySurchargeFilingPeriod
Namespace Prefix: | all_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum rate of the regular assessment for a deficit in a calendar year as a percentage of the greater of the deficit or of property premiums industry-wide for the prior year. + References No definition available. + Details
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Namespace Prefix: | all_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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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- Details
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Data Type: | na
Balance Type: |
Period Type: |