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Segments of Operations (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Total premiums earned | $ 946 us-gaap_PremiumsEarnedNetPropertyAndCasualty | $ 754 us-gaap_PremiumsEarnedNetPropertyAndCasualty
Net investment income | 388 us-gaap_NetInvestmentIncome | 361 us-gaap_NetInvestmentIncome
Other income | 47 us-gaap_OtherIncome | 21 us-gaap_OtherIncome
Revenues before realized gains (losses) | 1,437 afg_RevenuesBeforeRealizedGainsLosses | 1,192 afg_RevenuesBeforeRealizedGainsLosses
Realized gains on securities | 19 us-gaap_MarketableSecuritiesRealizedGainLoss | 19 us-gaap_MarketableSecuritiesRealizedGainLoss
Realized loss on subsidiaries | (162)afg_RealizedGainsLossesOnSubsidiaries | 0 afg_RealizedGainsLossesOnSubsidiaries
Total revenues | 1,294 us-gaap_Revenues | 1,211 us-gaap_Revenues
Property and Casualty Insurance [Member] |  |
Segment Reporting Information [Line Items] |  |
Net investment income | 79 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember | 67 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember
Other income | 6 us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember | 2 us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember
Revenues before realized gains (losses) | 1,031 afg_RevenuesBeforeRealizedGainsLosses / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember | 823 afg_RevenuesBeforeRealizedGainsLosses / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember
Annuity [Member] |  |
Segment Reporting Information [Line Items] |  |
Net investment income | 292 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityMember | 275 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityMember
Other income | 24 us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityMember | 18 us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityMember
Revenues before realized gains (losses) | 316 afg_RevenuesBeforeRealizedGainsLosses / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityMember | 293 afg_RevenuesBeforeRealizedGainsLosses / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityMember
Run-off Long-term Care and Life [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues before realized gains (losses) | 46 afg_RevenuesBeforeRealizedGainsLosses / us-gaap_StatementBusinessSegmentsAxis = afg_RunOffLongTermCareAndLifeMember | 51 afg_RevenuesBeforeRealizedGainsLosses / us-gaap_StatementBusinessSegmentsAxis = afg_RunOffLongTermCareAndLifeMember
Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues before realized gains (losses) | 44 afg_RevenuesBeforeRealizedGainsLosses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 25 afg_RevenuesBeforeRealizedGainsLosses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Specialty Property and transportation [Member] |  |
Segment Reporting Information [Line Items] |  |
Total premiums earned | 313 us-gaap_PremiumsEarnedNetPropertyAndCasualty / us-gaap_SubsegmentsAxis = afg_SpecialtyPropertyAndTransportationInsuranceMember | 301 us-gaap_PremiumsEarnedNetPropertyAndCasualty / us-gaap_SubsegmentsAxis = afg_SpecialtyPropertyAndTransportationInsuranceMember
Specialty casualty [Member] |  |
Segment Reporting Information [Line Items] |  |
Total premiums earned | 490 us-gaap_PremiumsEarnedNetPropertyAndCasualty / us-gaap_SubsegmentsAxis = afg_SpecialtyCasualtyInsuranceMember | 313 us-gaap_PremiumsEarnedNetPropertyAndCasualty / us-gaap_SubsegmentsAxis = afg_SpecialtyCasualtyInsuranceMember
Specialty financial [Member] |  |
Segment Reporting Information [Line Items] |  |
Total premiums earned | 120 us-gaap_PremiumsEarnedNetPropertyAndCasualty / us-gaap_SubsegmentsAxis = afg_SpecialtyFinancialInsuranceMember | 117 us-gaap_PremiumsEarnedNetPropertyAndCasualty / us-gaap_SubsegmentsAxis = afg_SpecialtyFinancialInsuranceMember
Specialty Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Total premiums earned | $ 23 us-gaap_PremiumsEarnedNetPropertyAndCasualty / us-gaap_SubsegmentsAxis = afg_SpecialtyOtherInsuranceMember | $ 23 us-gaap_PremiumsEarnedNetPropertyAndCasualty / us-gaap_SubsegmentsAxis = afg_SpecialtyOtherInsuranceMember

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- Definition This item represents 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. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 7 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of property and casualty premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486662&loc=d3e27175-158546 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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