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Investments (Details 4) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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Unrealized gain on: |  |  |  |  |  |
Pretax | $ 1,249 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax |  | $ 1,162 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax |  |  |
Deferred Tax and Amounts Attributable to Noncontrolling Interests | (450)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest |  | (419)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest |  |  |
Net | 799 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | [1] | 743 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | [1] | 685 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 563 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Fixed maturities - annuity segment [Member] |  |  |  |  |  |
Unrealized gain on: |  |  |  |  |  |
Pretax | 1,349 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_FixedMaturitiesAnnuitySegmentMember | [2] | 1,157 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_FixedMaturitiesAnnuitySegmentMember | [2] |  |
Deferred Tax and Amounts Attributable to Noncontrolling Interests | (472)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_FixedMaturitiesAnnuitySegmentMember | [2] | (405)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_FixedMaturitiesAnnuitySegmentMember | [2] |  |
Net | 877 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_FixedMaturitiesAnnuitySegmentMember | [2] | 752 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_FixedMaturitiesAnnuitySegmentMember | [2] |  |
Fixed maturities - all other [Member] |  |  |  |  |  |
Unrealized gain on: |  |  |  |  |  |
Pretax | 529 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_FixedMaturitiesAllOtherSegmentsMember |  | 503 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_FixedMaturitiesAllOtherSegmentsMember |  |  |
Deferred Tax and Amounts Attributable to Noncontrolling Interests | (196)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_FixedMaturitiesAllOtherSegmentsMember |  | (185)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_FixedMaturitiesAllOtherSegmentsMember |  |  |
Net | 333 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_FixedMaturitiesAllOtherSegmentsMember |  | 318 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_FixedMaturitiesAllOtherSegmentsMember |  |  |
Equity securities [Member] |  |  |  |  |  |
Unrealized gain on: |  |  |  |  |  |
Pretax | 224 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  | 218 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  |  |
Deferred Tax and Amounts Attributable to Noncontrolling Interests | (81)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  | (79)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  |  |
Net | 143 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  | 139 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  |  |
Deferred policy acquisition costs - annuity segment [Member] |  |  |  |  |  |
Unrealized gain on: |  |  |  |  |  |
Pretax | (601)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_DeferredPolicyAcquisitionCostsAnnuitySegmentMember |  | (531)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_DeferredPolicyAcquisitionCostsAnnuitySegmentMember |  |  |
Deferred Tax and Amounts Attributable to Noncontrolling Interests | 210 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_DeferredPolicyAcquisitionCostsAnnuitySegmentMember |  | 186 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_DeferredPolicyAcquisitionCostsAnnuitySegmentMember |  |  |
Net | (391)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_DeferredPolicyAcquisitionCostsAnnuitySegmentMember |  | (345)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_DeferredPolicyAcquisitionCostsAnnuitySegmentMember |  |  |
Annuity benefits accumulated [Member] |  |  |  |  |  |
Unrealized gain on: |  |  |  |  |  |
Pretax | (179)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_AnnuityBenefitsAndOtherLiabilitiesMember |  | (112)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_AnnuityBenefitsAndOtherLiabilitiesMember |  |  |
Deferred Tax and Amounts Attributable to Noncontrolling Interests | 63 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_AnnuityBenefitsAndOtherLiabilitiesMember |  | 39 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_AnnuityBenefitsAndOtherLiabilitiesMember |  |  |
Net | (116)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_AnnuityBenefitsAndOtherLiabilitiesMember |  | (73)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_AnnuityBenefitsAndOtherLiabilitiesMember |  |  |
Life, accident and health reserves [Member] |  |  |  |  |  |
Unrealized gain on: |  |  |  |  |  |
Pretax | (109)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_LifeAccidentAndHealthReservesMember |  | (104)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_LifeAccidentAndHealthReservesMember |  |  |
Deferred Tax and Amounts Attributable to Noncontrolling Interests | 38 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_LifeAccidentAndHealthReservesMember |  | 36 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_LifeAccidentAndHealthReservesMember |  |  |
Net | (71)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_LifeAccidentAndHealthReservesMember |  | (68)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_LifeAccidentAndHealthReservesMember |  |  |
Unearned revenue [Member] |  |  |  |  |  |
Unrealized gain on: |  |  |  |  |  |
Pretax | 36 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_UnearnedRevenueMember |  | 31 afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentPretax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_UnearnedRevenueMember |  |  |
Deferred Tax and Amounts Attributable to Noncontrolling Interests | (12)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_UnearnedRevenueMember |  | (11)afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentDeferredTaxAndNonControllingInterest / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_UnearnedRevenueMember |  |  |
Net | $ 24 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_UnearnedRevenueMember |  | $ 20 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_UnearnedRevenueMember |  |  |
[1] | Includes net unrealized gains of $57 million at March 31, 2015 compared to $58 million at December 31, 2014 related to securities for which only the credit portion of an other-than-temporary impairment has been recorded in earnings.
[2] | Unrealized gains on fixed maturity investments supporting AFG’s annuity benefits accumulated.

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