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Acquisitions and Sale of Businesses (Details) (Run-off long-term care insurance business [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Run-off long-term care insurance business [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Estimated sale proceeds | $ 14 afg_DisposalGroupEstimatedProceedsfromDivestitureofBusinessesNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | [1]
Assets of businesses sold: |  |
Cash and investments | 1,397 afg_DisposalGroupCashAndInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
Recoverables from reinsurers | 603 afg_DisposalGroupReinsuranceRecoverables / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
Deferred policy acquisition costs | 15 afg_DisposalGroupDeferredPolicyAcquisitionCosts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
Other receivables | 14 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
Other assets | 7 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
Goodwill | 2 us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
Total assets | 2,038 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
Liabilities of businesses sold: |  |
Annuity benefits accumulated | 270 afg_DisposalGroupAnnuityBenefitsAccumulated / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
Life, accident and health reserves | 1,537 afg_DisposalGroupLifeAccidentAndHealthReserves / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
Other liabilities | 27 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
Total liabilities | 1,834 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
Reclassify net unrealized gain on marketable securities | 28 afg_DisposalGroupReclassifyNetUnrealizedGainOnMarketableSecurities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
Net assets of businesses sold | 176 afg_AssetsOfDisposalGroupIncludingDiscontinuedOperationNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
Pretax loss on subsidiaries | $ (162)us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember |
[1] | Includes fair value of the potential additional consideration and is shown net of estimated expenses.

X
- Definition The net value (measured at the lower of net carrying value or fair value less cost of disposal) for assets of a disposal group, including a component of the entity (discontinued operation), to be sold or that has been disposed of through sale, as of the financial statement date. + References No definition available. + Details
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- Definition Annuity benefits accumulated of the disposal group. + References No definition available. + Details
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- Definition The sum of unrestricted cash and investments of the disposal group. + References No definition available. + Details
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- Definition Deferred policy acquisition costs of the disposal group. + References No definition available. + Details
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- Definition The estimated net 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 Life, accident and health reserves of the disposal group. + References No definition available. + Details
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- Definition Reclassify net unrealized gain on marketable securities of the disposal group. + References No definition available. + Details
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- Definition Reinsurance recoverables of the disposal group. + References No definition available. + Details
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Balance Type: | debit
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- Definition Amount classified as assets attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
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- Definition Amount classified as accounts, notes and loans receivable attributable to disposal group held for sale or disposed of. + 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 (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount classified as goodwill attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount classified as other assets attributable to disposal group held for sale or disposed of. + 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 (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount classified as other liabilities attributable to disposal group held for sale or disposed of. + 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 (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement. + 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 (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 + Details
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- Definition Amount classified as liabilities attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760 + Details
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