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Managed Investment Entities (Details Textual) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 collateralizedloanobligation | Mar. 31, 2014 | Dec. 31, 2014
Variable Interest Entity [Line Items] |  |  |
Percentage of investment of most subordinate debt tranche, Minimum | 15.00%afg_PercentageOfInvestmentOfMostSubordinateDebtTrancheOfVariableInterestEntityMinimum |  |
Percentage of investment of most subordinate debt tranche, Maximum | 51.20%afg_PercentageOfInvestmentOfMostSubordinateDebtTrancheOfVariableInterestEntityMaximum |  |
Number of collateralized loan obligation entities | 12 afg_NumberOfCollateralizedLoanObligationEntities |  |
Proceeds received by subsidiaries related to redemptions of managed investment entities liabilities | $ 1 afg_ProceedsReceivedBySubsidiariesRelatedtoRedemptionsofManagedInvestmentEntitiesLiabilities | $ 29 afg_ProceedsReceivedBySubsidiariesRelatedtoRedemptionsofManagedInvestmentEntitiesLiabilities |
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments | 54 afg_DifferenceBetweenAggregateUnpaidPrincipalBalanceAndFairValueOfVariableInterestEntityInvestments |  | 83 afg_DifferenceBetweenAggregateUnpaidPrincipalBalanceAndFairValueOfVariableInterestEntityInvestments
Difference between aggregate unpaid principal balance and carrying value of CLOs' debt | 119 afg_DifferenceBetweenAggregateUnpaidPrincipalBalanceAndFairValueOfVariableInterestEntityDebt |  | 131 afg_DifferenceBetweenAggregateUnpaidPrincipalBalanceAndFairValueOfVariableInterestEntityDebt
Carrying amount of CLO loans in default | 5 afg_CarryingAmountOfVariableInterestEntityLoansInDefault |  | 2 afg_CarryingAmountOfVariableInterestEntityLoansInDefault
Aggregate unpaid principal balance of CLO loans in default | 10 afg_AggregateUnpaidPrincipalBalanceOfVariableInterestEntityLoansInDefault |  | 6 afg_AggregateUnpaidPrincipalBalanceOfVariableInterestEntityLoansInDefault
Variable interest entity, primary beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate fair value of investment in collateralized loan obligations | 325 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  | 289 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Subordinated debt obligations [Member] | Variable interest entity, primary beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Aggregate fair value of investment in collateralized loan obligations | 127 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_DebtInstrumentAxis = us-gaap_SubordinatedDebtObligationsMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Senior debt obligations [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date |  | 3 afg_FaceAmountOfManagedInvestmentEntitiesLiabilitiesPurchasedBySubsidiariesAfterIssuanceDate / us-gaap_DebtInstrumentAxis = us-gaap_SeniorDebtObligationsMember |
Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date |  | $ 3 afg_AmountPaidBySubsidiariesToPurchaseManagedInvestmentEntitiesLiabilitiesAfterIssuanceDate. / us-gaap_DebtInstrumentAxis = us-gaap_SeniorDebtObligationsMember |

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- Definition Aggregate unpaid principal balance of variable interest entity loans in default. + References No definition available. + Details
Name: | afg_AggregateUnpaidPrincipalBalanceOfVariableInterestEntityLoansInDefault
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date. + References No definition available. + Details
Name: | afg_AmountPaidBySubsidiariesToPurchaseManagedInvestmentEntitiesLiabilitiesAfterIssuanceDate.
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Carrying amount of variable interest entity loans in default. + References No definition available. + Details
Name: | afg_CarryingAmountOfVariableInterestEntityLoansInDefault
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Difference between aggregate unpaid principal balance and fair value of variable interest entity debt. + References No definition available. + Details
Name: | afg_DifferenceBetweenAggregateUnpaidPrincipalBalanceAndFairValueOfVariableInterestEntityDebt
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Difference between aggregate unpaid principal balance and fair value of variable interest entity investments. + References No definition available. + Details
Name: | afg_DifferenceBetweenAggregateUnpaidPrincipalBalanceAndFairValueOfVariableInterestEntityInvestments
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date. + References No definition available. + Details
Name: | afg_FaceAmountOfManagedInvestmentEntitiesLiabilitiesPurchasedBySubsidiariesAfterIssuanceDate
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of collateralized loan obligation entities. + References No definition available. + Details
Name: | afg_NumberOfCollateralizedLoanObligationEntities
Namespace Prefix: | afg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of investment of most subordinate debt tranche of variable interest entity. + References No definition available. + Details
Name: | afg_PercentageOfInvestmentOfMostSubordinateDebtTrancheOfVariableInterestEntityMaximum
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum percentage of investment of most subordinate debt tranche of variable interest entity. + References No definition available. + Details
Name: | afg_PercentageOfInvestmentOfMostSubordinateDebtTrancheOfVariableInterestEntityMinimum
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Proceeds received by subsidiaries related to redemptions of managed investment entities liabilities. + References No definition available. + Details
Name: | afg_ProceedsReceivedBySubsidiariesRelatedtoRedemptionsofManagedInvestmentEntitiesLiabilities
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5747-111685 + Details
Name: | us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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