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Deferred Policy Acquisition Costs (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward] |  |
Deferred policy acquisition costs and present value of future profits, beginning balance | $ 821 us-gaap_DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired | $ 975 us-gaap_DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired
Deferred policy acquisition costs and present value of future profits, additions | 168 us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAdditions | 178 us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAdditions
Deferred policy acquisition costs and present value of future profits, periodic amortization | (165)us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1 | (158)us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1
Deferred policy acquisition costs and present value of future profits, change included in realized gains | 2 afg_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortizationExpenseNetInvestmentGainsLosses |
Deferred policy acquisition costs and present value of future profits, foreign currency translation | 1 afg_DeferredPolicyAcquisitionCostAndPresentValueOfFutureProfitsForeignCurrencyTranslationAdjustment |
Deferred policy acquisition costs and present value of future profits, change in unrealized | (71)afg_DeferredPolicyAcquisitionCostsandPresentValueofFutureProfitsChangeinUnrealizedInvestmentGainLoss | (105)afg_DeferredPolicyAcquisitionCostsandPresentValueofFutureProfitsChangeinUnrealizedInvestmentGainLoss
Deferred policy acquisition costs and present value of future profits, ending balance | 756 us-gaap_DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired | 890 us-gaap_DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired
Property and Casualty Insurance [Member] |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Deferred policy acquisition costs, beginning balance | 221 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember | 211 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember
Deferred policy acquisition costs, additions | 121 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember | 124 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember
Deferred policy acquisition costs, periodic amortization | (126)afg_DeferredPolicyAcquisitionCostsAmortizationExpensePeriodicAmortization / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember | (121)afg_DeferredPolicyAcquisitionCostsAmortizationExpensePeriodicAmortization / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember
Deferred policy acquisition costs, foreign currency translation | 1 us-gaap_DeferredPolicyAcquisitionCostForeignCurrencyTranslationAdjustment / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember |
Deferred policy acquisition costs, ending balance | 217 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember | 214 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember
Annuity and Run-off Long-term Care and Life [Member] |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Deferred policy acquisition costs, beginning balance | 925 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | 875 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Deferred policy acquisition costs, additions | 44 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | 50 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Deferred policy acquisition costs, periodic amortization | (29)afg_DeferredPolicyAcquisitionCostsAmortizationExpensePeriodicAmortization / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | (27)afg_DeferredPolicyAcquisitionCostsAmortizationExpensePeriodicAmortization / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Deferred policy acquisition costs, change included in realized gains | 2 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseNetInvestmentGainsLosses / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember |
Deferred policy acquisition costs, ending balance | 942 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | 898 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Movement in Deferred Sales Inducements [Roll Forward] |  |
Deferred sales inducements, beginning balance | 132 us-gaap_DeferredSalesInducementsNet / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | 149 us-gaap_DeferredSalesInducementsNet / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Deferred sales inducements, additions | 3 us-gaap_DeferredSalesInducementsAdditions / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | 4 us-gaap_DeferredSalesInducementsAdditions / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Deferred sales inducements, periodic amortization | (7)us-gaap_DeferredSalesInducementsAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | (7)us-gaap_DeferredSalesInducementsAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Deferred sales inducements, change included in realized gains | 0 afg_DeferredSalesInducementsAmortizationExpenseNetInvestmentGainsLosses / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember |
Deferred sales inducements, ending balance | 128 us-gaap_DeferredSalesInducementsNet / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | 146 us-gaap_DeferredSalesInducementsNet / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Movement in Present Value of Future Insurance Profits [Roll Forward] |  |
Present value of future profits, beginning balance | 74 us-gaap_ValueOfBusinessAcquiredVOBA / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | 85 us-gaap_ValueOfBusinessAcquiredVOBA / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Present value of future profits, periodic amortization | (3)us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1 / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | (3)us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1 / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Present value of future profits, ending balance | 71 us-gaap_ValueOfBusinessAcquiredVOBA / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | 82 us-gaap_ValueOfBusinessAcquiredVOBA / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Movement in Unrealized Gains (Losses) Related to Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward] |  |
Unrealized investment gains (losses), beginning balance | (531)afg_DeferredPolicyAcquisitionCostsandValueofBusinessAcquiredUnrealizedInvestmentGainLoss / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | (345)afg_DeferredPolicyAcquisitionCostsandValueofBusinessAcquiredUnrealizedInvestmentGainLoss / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Unrealized investment gains (losses), change in unrealized | (71)afg_DeferredPolicyAcquisitionCostsandValueofBusinessAcquiredUnrealizedInvestmentGainLossChangeinUnrealized / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | (105)afg_DeferredPolicyAcquisitionCostsandValueofBusinessAcquiredUnrealizedInvestmentGainLossChangeinUnrealized / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Unrealized investment gains (losses), ending balance | (602)afg_DeferredPolicyAcquisitionCostsandValueofBusinessAcquiredUnrealizedInvestmentGainLoss / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | (450)afg_DeferredPolicyAcquisitionCostsandValueofBusinessAcquiredUnrealizedInvestmentGainLoss / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward] |  |
Deferred policy acquisition costs and present value of future profits, beginning balance | 600 us-gaap_DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | 764 us-gaap_DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Deferred policy acquisition costs and present value of future profits, additions | 47 us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAdditions / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | 54 us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAdditions / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Deferred policy acquisition costs and present value of future profits, periodic amortization | (39)us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1 / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | (37)us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1 / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Deferred policy acquisition costs and present value of future profits, change included in realized gains | 2 afg_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortizationExpenseNetInvestmentGainsLosses / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember |
Deferred policy acquisition costs and present value of future profits, change in unrealized | (71)afg_DeferredPolicyAcquisitionCostsandPresentValueofFutureProfitsChangeinUnrealizedInvestmentGainLoss / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | (105)afg_DeferredPolicyAcquisitionCostsandPresentValueofFutureProfitsChangeinUnrealizedInvestmentGainLoss / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember
Deferred policy acquisition costs and present value of future profits, ending balance | $ 539 us-gaap_DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember | $ 676 us-gaap_DeferredPolicyAcquisitionCostsAndValueOfBusinessAcquired / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityLongtermCareandLifeMember

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- Definition Amount of increase (decrease) in deferred policy acquisition cost (DAC) and present value of future profits due to the effect of foreign currency translation. + References No definition available. + Details
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- Definition Amount of amortization of deferred policy acquisition costs and present value of future profits due to realized investment gains or losses. + References No definition available. + Details
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- Definition Adjustment to deferred policy acquisition cost (DAC) and present value of future profits due to unrealized investment gain (loss). + References No definition available. + Details
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- Definition The impact of the amount of increase (decrease) in unrealized investment gains and losses on deferred policy acquisition cost (DAC) and value of business acquired. + References No definition available. + Details
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- Definition Amount of increase (decrease) in deferred policy acquisition cost (DAC) and present value of future profits due to unrealized investment gain (loss). + References No definition available. + Details
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- Definition The amount of amortization of deferred sales inducement costs due to realized investment gains or losses. + References No definition available. + Details
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- Definition Amount of amortization of deferred policy acquisition costs due to realized investment gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 35 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28247317&loc=d3e10138-158409 + Details
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- Definition Amount of increase (decrease) in deferred policy acquisition cost (DAC) due to the effect of foreign currency translation. + References No definition available. + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date. + 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 825 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6487548&loc=d3e32546-158582 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755678&loc=d3e11446-158418 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6481648&loc=d3e11198-158413 Reference 5: 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.(a),7) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 7 + Details
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- Definition Total amount of policy acquisition costs capitalized during the income statement period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 + Details
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- Definition Additions during the period in (a) capitalized policy acquisition costs, and (b) capitalized present value of future profits (also known as PVFP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (2) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 + Details
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- Definition Amount of deferred policy acquisition costs and capitalized present value of the future profits (PVFP) expensed. Acquisition costs are costs that are related directly to the successful acquisition of new or renewal insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (2) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 + Details
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- Definition Carrying (unamortized) amount as of the balance sheet date of deferred policy acquisition costs and value of business acquired (also called present value of future profits). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (2) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 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 210.7-03.7) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The amount of deferred sales inducement costs capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11332-158416 + Details
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- Definition The amount of deferred sales inducement costs charged against earnings during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11332-158416 + Details
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- Definition Amount of the present value of future profits asset amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (2) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 + Details
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- Definition The remaining unamortized carrying amount as of the balance sheet date of expected future earnings from insurance contracts acquired (also known as present value of future profits). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 7 + Details
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