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Acquisitions and Sale of Businesses (Details Textual) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Apr. 01, 2014 | Dec. 31, 2014 | Dec. 31, 2014 | Mar. 27, 2014
Acquisitions and Sale of Businesses [Line Items] |  |  |  |  |  |
Payments to acquire business | $ 0 us-gaap_PaymentsToAcquireBusinessesGross | $ 8 us-gaap_PaymentsToAcquireBusinessesGross |  |  |  |
Run-off long-term care insurance business [Member] |  |  |  |  |  |
Acquisitions and Sale of Businesses [Line Items] |  |  |  |  |  |
Sale proceeds | 7 afg_DisposalGroupProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |  |  |  |  |
Additional sale proceeds based on the release of certain statutory liabilities of the legal entities sold | 13 afg_DisposalGroupAdditionalProceedsfromDivestitureofBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |  |  |  |  |
Carrying value of the assets and liabilities of business sold as a percentage of total assets and liabilities | 4.00%afg_DisposalGroupCarryingValueofAssetsandLiabilitiesasaPercentageofTotalAssetsandLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |  |  |  |  |
Summit Holding Southeast, Inc [Member] |  |  |  |  |  |
Acquisitions and Sale of Businesses [Line Items] |  |  |  |  |  |
Payments to acquire business |  |  | 259 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = afg_SummitHoldingSoutheastIncMember |  |  |
Capital contributions to acquired business |  |  | 140 afg_CapitalContributionsToSubsidiaries / us-gaap_BusinessAcquisitionAxis = afg_SummitHoldingSoutheastIncMember |  |  |
Total capital investment in acquired business |  |  | 399 afg_CapitalInvestmentInSubsidiariesTotal / us-gaap_BusinessAcquisitionAxis = afg_SummitHoldingSoutheastIncMember |  |  |
Net written premiums of acquired business |  |  |  | 410 us-gaap_PremiumsWrittenNet / us-gaap_BusinessAcquisitionAxis = afg_SummitHoldingSoutheastIncMember | 539 us-gaap_PremiumsWrittenNet / us-gaap_BusinessAcquisitionAxis = afg_SummitHoldingSoutheastIncMember |
Net earned premiums of acquired business | 129 us-gaap_PremiumsEarnedNet / us-gaap_BusinessAcquisitionAxis = afg_SummitHoldingSoutheastIncMember |  |  |  |  |
Underwriting profit of acquired business | 5 afg_PropertyAndCasualtyInsuranceUnderwritingIncomeLoss / us-gaap_BusinessAcquisitionAxis = afg_SummitHoldingSoutheastIncMember |  |  |  |  |
Selective Insurance Company of America Self-Insured Pooled Group [Member] |  |  |  |  |  |
Acquisitions and Sale of Businesses [Line Items] |  |  |  |  |  |
Payments to acquire business |  |  |  |  |  | 8 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = afg_SelectiveInsuranceCompanyOfAmericaSelfInsuredPooledGroupMember
Net written premiums of acquired business |  |  |  |  | 23 us-gaap_PremiumsWrittenNet / us-gaap_BusinessAcquisitionAxis = afg_SelectiveInsuranceCompanyOfAmericaSelfInsuredPooledGroupMember |
In-force gross written premiums of acquired book of business |  |  |  |  |  | 38 afg_PremiumsWrittenGrossInForce / us-gaap_BusinessAcquisitionAxis = afg_SelectiveInsuranceCompanyOfAmericaSelfInsuredPooledGroupMember
Gross written premiums of acquired business |  |  |  |  | 33 us-gaap_PremiumsWrittenGross / us-gaap_BusinessAcquisitionAxis = afg_SelectiveInsuranceCompanyOfAmericaSelfInsuredPooledGroupMember |
Minimum [Member] | Run-off long-term care insurance business [Member] |  |  |  |  |  |
Acquisitions and Sale of Businesses [Line Items] |  |  |  |  |  |
Expected after-tax cash proceeds from the sale of business | 105 us-gaap_ProceedsFromIncomeTaxRefunds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
Maximum [Member] | Run-off long-term care insurance business [Member] |  |  |  |  |  |
Acquisitions and Sale of Businesses [Line Items] |  |  |  |  |  |
Expected after-tax cash proceeds from the sale of business | $ 115 us-gaap_ProceedsFromIncomeTaxRefunds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |

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- Definition The additional sale proceeds associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References No definition available. + Details
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- Definition The sale proceeds associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References No definition available. + Details
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- Definition Underwriting income (loss) for the property and casualty insurance segment, which is calculated as premiums earned less losses and loss adjustment expenses less commissions and other underwriting expenses. + References No definition available. + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: 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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