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Acquisitions and Sale of Businesses (Details 1) (Run-off long-term care insurance business [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Run-off long-term care insurance business [Member] |  |
Life, accident and health net earned premiums: |  |
Long-term care | $ 17 afg_DisposalGroupLifeAccidentandHealthPremiumsLongTermCare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | $ 19 afg_DisposalGroupLifeAccidentandHealthPremiumsLongTermCare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember
Life operations | 3 afg_DisposalGroupLifeAccidentandHealthPremiumsLifeOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | 3 afg_DisposalGroupLifeAccidentandHealthPremiumsLifeOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember
Net investment income | 18 afg_DisposalGroupNetInvestmentIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | 21 afg_DisposalGroupNetInvestmentIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember
Realized gains (losses) on securities and other income | (2)afg_DisposalGroupMarketableSecuritiesRealizedGainLossandOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | 1 afg_DisposalGroupMarketableSecuritiesRealizedGainLossandOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember
Total revenues | 36 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | 44 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember
Annuity benefits | 2 afg_DisposalGroupAnnuityBenefits / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | 2 afg_DisposalGroupAnnuityBenefits / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember
Life, accident and health benefits: |  |
Long-term care | 21 afg_DisposalGroupLifeAccidentandHealthBenefitsLongTermCare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | 29 afg_DisposalGroupLifeAccidentandHealthBenefitsLongTermCare / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember
Life operations | 3 afg_DisposalGroupLifeAccidentandHealthBenefitsLifeOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | 3 afg_DisposalGroupLifeAccidentandHealthBenefitsLifeOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember
Annuity and supplemental insurance acquisition expenses | 3 afg_DisposalGroupAnnuityandSupplementalInsuranceAcquisitionExpenses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | 3 afg_DisposalGroupAnnuityandSupplementalInsuranceAcquisitionExpenses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember
Other expenses | 4 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | 4 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember
Total costs and expenses | 33 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | 41 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember
Earnings before income taxes | $ 3 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | $ 3 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember

X
- Definition Annuity and supplemental insurance acquisition expenses of the disposal group. + References No definition available. + Details
Name: | afg_DisposalGroupAnnuityandSupplementalInsuranceAcquisitionExpenses
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Annuity benefits of the disposal group includes 1) interest credited to policyholders accounts, which provides a guaranteed yield, 2) expenses related to excess benefits expected to be paid on future deaths and annuitizations and 3) net expenses related to changes in embedded derivatives on equity indexed annuities offset by equity index call options. + References No definition available. + Details
Name: | afg_DisposalGroupAnnuityBenefits
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The Life operations portion of life, accident and health benefits of the disposal group. + References No definition available. + Details
Name: | afg_DisposalGroupLifeAccidentandHealthBenefitsLifeOperations
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The Long-term care portion of life, accident and health benefits of the disposal group. + References No definition available. + Details
Name: | afg_DisposalGroupLifeAccidentandHealthBenefitsLongTermCare
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The Life operations portion of life, accident and health premiums of the disposal group. + References No definition available. + Details
Name: | afg_DisposalGroupLifeAccidentandHealthPremiumsLifeOperations
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The Long-term care portion of life, accident and health premiums of the disposal group. + References No definition available. + Details
Name: | afg_DisposalGroupLifeAccidentandHealthPremiumsLongTermCare
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This item represents amount of other income attributable to the disposal group and the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity of the disposal group. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities of the disposal group. + References No definition available. + Details
Name: | afg_DisposalGroupMarketableSecuritiesRealizedGainLossandOtherIncome
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, after investment expense, of income earned from investments in securities and real estate of the disposal group. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References No definition available. + Details
Name: | afg_DisposalGroupNetInvestmentIncome
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | afg_LifeAccidentandHealthBenefitsAbstract
Namespace Prefix: | afg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | afg_LifeAccidentandHealthNetEarnedPremiumsAbstract
Namespace Prefix: | afg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of operating expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of other expense attributable to disposal group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration