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Insurance - Reinsurance Retention (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2017 USD ($)
California Workers’ Compensation |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance retention policy, amount retained | $ 2 |
Reinsurance coverage amount | $ 148 |
Reinsurance coverage amount by internal reinsurance program as a percentage of reinsurance coverage amount | 1.00% | [1]
Reinsurance retention policy, maximum loss for claims up to the reinsurance coverage limit | $ 3 | [2]
Other Workers’ Compensation |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance retention policy, amount retained | 3 |
Reinsurance coverage amount | $ 37 |
Reinsurance coverage amount by internal reinsurance program as a percentage of reinsurance coverage amount | 0.00% | [1]
Reinsurance retention policy, maximum loss for claims up to the reinsurance coverage limit | $ 3 | [2]
Commercial Umbrella |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance retention policy, amount retained | 1 |
Reinsurance coverage amount | $ 49 |
Reinsurance coverage amount by internal reinsurance program as a percentage of reinsurance coverage amount | 13.00% | [1]
Reinsurance retention policy, maximum loss for claims up to the reinsurance coverage limit | $ 7 | [2]
Property — General |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance retention policy, amount retained | 5 |
Reinsurance coverage amount | $ 45 |
Reinsurance coverage amount by internal reinsurance program as a percentage of reinsurance coverage amount | 0.00% | [1]
Reinsurance retention policy, maximum loss for claims up to the reinsurance coverage limit | $ 5 | [2]
Property — Catastrophe |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance retention policy, amount retained | 15 |
Reinsurance coverage amount | $ 85 |
Reinsurance coverage amount by internal reinsurance program as a percentage of reinsurance coverage amount | 5.00% | [1]
Reinsurance retention policy, maximum loss for claims up to the reinsurance coverage limit | $ 19 | [2]
Neon Lloyd’s Syndicate |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance retention policy, amount retained | 15 |
Reinsurance coverage amount | $ 210 |
Reinsurance coverage amount by internal reinsurance program as a percentage of reinsurance coverage amount | 0.00% | [1]
Reinsurance retention policy, maximum loss for claims up to the reinsurance coverage limit | $ 15 | [2]
Riverfront Re Ltd. catastrophe bond |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance retention policy, amount retained | 100 | [3]
Reinsurance coverage amount | $ 200 | [3]
Reinsurance coverage amount by internal reinsurance program as a percentage of reinsurance coverage amount | 5.00% | [1],[3]
AFG | California Workers’ Compensation |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance coverage amount | $ 1 | [1]
AFG | Other Workers’ Compensation |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance coverage amount | 0 | [1]
AFG | Commercial Umbrella |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance coverage amount | 6 | [1]
AFG | Property — General |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance coverage amount | 0 | [1]
AFG | Property — Catastrophe |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance coverage amount | 4 | [1]
AFG | Neon Lloyd’s Syndicate |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance coverage amount | 0 | [1]
AFG | Riverfront Re Ltd. catastrophe bond |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance coverage amount | $ 10 | [1],[3]
[1] | Includes the participation of AFG’s internal reinsurance program.
[2] | Maximum loss for claims up to reinsurance coverage limit.
[3] | Includes aggregate coverage. See description below.

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- Definition Amount of risk reinsured by internal reinsurance program per company policy as a percentage of the amount of risk reinsured in excess of stated retention per company policy. + References No definition available. + Details
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Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This amount represents the maximum loss for claims from the primary retention amount plus the participation of the Company’s internal reinsurance program for reinsurance coverage. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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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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Data Type: | xbrli:monetaryItemType
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- Definition Amount of risk reinsured in excess of stated retention per company policy. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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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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- Details
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