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Consolidated Statement of Changes in Equity (Unaudited) (USD $) In Millions, except Share data, unless otherwise specified | Total USD ($) | Total USD ($) | Common Shares | Common Stock and Capital Surplus USD ($) | Retained Earnings Approp. USD ($) | Retained Earnings Unapprop. USD ($) | Accumulated Other Comprehensive Inc. (Loss) USD ($) | Noncontrolling Interests USD ($)
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Beginning Balance at Dec. 31, 2013 | $ 4,769 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 4,599 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | $ 1,213 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | $ 49 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsAppropriatedMember | $ 2,777 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsUnappropriatedMember | $ 560 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 170 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Beginning Balance, shares at Dec. 31, 2013 |  |  | 89,513,386 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net earnings | 107 us-gaap_ProfitLoss | 103 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 103 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsUnappropriatedMember |  | 4 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other comprehensive income | 120 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 117 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | 117 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 3 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Allocation of losses of managed investment entities | 0 afg_AllocationOfLossesOfManagedInvestmentEntities | 0 afg_AllocationOfLossesOfManagedInvestmentEntities / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | 0 afg_AllocationOfLossesOfManagedInvestmentEntities / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsAppropriatedMember |  |  | 0 afg_AllocationOfLossesOfManagedInvestmentEntities / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Dividends on Common Stock | (19)us-gaap_DividendsCommonStockCash | (19)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | (19)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsUnappropriatedMember |  |
Shares issued: |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  | 323,473 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Exercise of stock options | 11 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 11 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | 11 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |  |
Other benefit plans, shares |  |  | 192,525 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Other benefit plans | 5 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 5 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | 5 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |  |
Dividend reinvestment plan, shares |  |  | 3,343 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stock-based compensation expense | 5 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 5 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | 5 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |  |
Shares acquired and retired, shares |  |  | (419,938)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Shares acquired and retired | (24)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | (24)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | (6)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  | (18)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsUnappropriatedMember |  |
Shares exchanged - benefit plans, shares |  |  | (23,790)afg_StockRepurchasedSharesExchangedInStockCompensationPlansShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Shares exchanged - benefit plans | (1)afg_StockRepurchasedSharesExchangedInStockCompensationPlansValue | (1)afg_StockRepurchasedSharesExchangedInStockCompensationPlansValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | (1)afg_StockRepurchasedSharesExchangedInStockCompensationPlansValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsUnappropriatedMember |  |
Ending Balance at Mar. 31, 2014 | 4,973 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 4,796 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | 1,228 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | 49 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsAppropriatedMember | 2,842 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsUnappropriatedMember | 677 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 177 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending Balance, shares at Mar. 31, 2014 |  |  | 89,588,999 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Beginning Balance at Dec. 31, 2014 | 5,054 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 4,879 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | 1,240 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | (2)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsAppropriatedMember | 2,914 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsUnappropriatedMember | 727 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 175 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Beginning Balance, shares at Dec. 31, 2014 | 87,708,793 us-gaap_CommonStockSharesOutstanding |  | 87,708,793 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Cumulative effect of accounting change for variable interest entities | 2 afg_CumulativeEffectofNewAccountingPrincipleinPeriodofAdoption | 2 afg_CumulativeEffectofNewAccountingPrincipleinPeriodofAdoption / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | 2 afg_CumulativeEffectofNewAccountingPrincipleinPeriodofAdoption / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsAppropriatedMember |  |  |
Net earnings | 25 us-gaap_ProfitLoss | 19 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 19 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsUnappropriatedMember |  | 6 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other comprehensive income | 50 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 49 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | 49 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Dividends on Common Stock | (22)us-gaap_DividendsCommonStockCash | (22)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | (22)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsUnappropriatedMember |  |
Shares issued: |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  | 489,001 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Exercise of stock options | 20 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 20 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | 20 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |  |
Other benefit plans, shares |  |  | 233,224 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Other benefit plans | 4 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 4 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | 4 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |  |
Dividend reinvestment plan, shares |  |  | 3,606 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Dividend reinvestment plan | 0 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan | 0 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | 0 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |  |
Stock-based compensation expense | 5 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 5 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | 5 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  |  |  |
Shares acquired and retired, shares |  |  | (516,276)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Shares acquired and retired | (31)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | (31)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | (8)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember |  | (23)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsUnappropriatedMember |  |
Shares exchanged - benefit plans, shares |  |  | (32,633)afg_StockRepurchasedSharesExchangedInStockCompensationPlansShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Shares exchanged - benefit plans | (2)afg_StockRepurchasedSharesExchangedInStockCompensationPlansValue | (2)afg_StockRepurchasedSharesExchangedInStockCompensationPlansValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | (2)afg_StockRepurchasedSharesExchangedInStockCompensationPlansValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsUnappropriatedMember |  |
Other | (5)us-gaap_StockholdersEquityOther |  |  |  |  |  |  | (5)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending Balance at Mar. 31, 2015 | $ 5,100 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 4,923 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | $ 1,261 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember | $ 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsAppropriatedMember | $ 2,886 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsUnappropriatedMember | $ 776 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 177 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending Balance, shares at Mar. 31, 2015 | 87,885,715 us-gaap_CommonStockSharesOutstanding |  | 87,885,715 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |

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