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v2.4.1.9

Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Summary of Carrying value of long-term debt |  |
Long-term debt | $ 1,061 us-gaap_LongTermDebt | $ 1,061 us-gaap_LongTermDebt
AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Other long-term debt | 3 us-gaap_OtherLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3 us-gaap_OtherLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Long-term debt | 840 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 840 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Subsidiaries [Member] |  |
Summary of Carrying value of long-term debt |  |
Long-term debt | 71 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 71 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Notes payable secured by real estate due 2015 through 2016 | 59 afg_LongTermNotesPayableSecuredByRealEstate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 59 afg_LongTermNotesPayableSecuredByRealEstate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
National Interstate bank credit facility | 12 us-gaap_LoansPayableToBank / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 12 us-gaap_LoansPayableToBank / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
9-7/8% Senior Notes due June 2019 [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Senior Notes | 350 us-gaap_SeniorNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = afg_SeniorNotesDueInJune2019Member | 350 us-gaap_SeniorNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = afg_SeniorNotesDueInJune2019Member
6-3/8% Senior Notes due June 2042 [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Senior Notes | 230 us-gaap_SeniorNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = afg_SeniorNotesDueInJune2042Member | 230 us-gaap_SeniorNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = afg_SeniorNotesDueInJune2042Member
5-3/4% Senior Notes due August 2042 [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Senior Notes | 125 us-gaap_SeniorNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = afg_SeniorNotesDueInAugust2042Member | 125 us-gaap_SeniorNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = afg_SeniorNotesDueInAugust2042Member
7% Senior Notes due September 2050 [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Senior Notes | 132 us-gaap_SeniorNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = afg_SeniorNotesDueInSeptember2050Member | 132 us-gaap_SeniorNotes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = afg_SeniorNotesDueInSeptember2050Member
6-1/4% Subordinated Debentures due September 2054 [Member] | AFG [Member] |  |
Summary of Carrying value of long-term debt |  |
Subordinated Debentures | $ 150 us-gaap_SubordinatedDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = afg_SubordinatedDebenturesDueInSeptember2054Member | $ 150 us-gaap_SubordinatedDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = afg_SubordinatedDebenturesDueInSeptember2054Member

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- Definition Long term notes payable to banks that are secured by real estate assets. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
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