XML 72 R59.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Managed Investment Entities - Narrative (Details) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
May 31, 2016 USD ($) | May 31, 2015 USD ($) | Sep. 30, 2016 USD ($) collateralizedloanobligation | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of investment of most subordinate debt tranche, Minimum |  |  | 15.00% |  |
Percentage of investment of most subordinate debt tranche, Maximum |  |  | 60.70% |  |
Number of collateralized loan obligation entities | collateralizedloanobligation |  |  | 14 |  |
Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date |  |  | $ 19 |  |
Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date |  |  | 15 |  |
Proceeds received by subsidiaries related to sales and redemptions of managed investment entities liabilities |  |  | 69 | $ 1 |
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments |  |  | 93 |  | $ 214
Difference between aggregate unpaid principal balance and carrying value of CLOs' debt |  |  | 159 |  | 205
Carrying amount of CLO loans in default |  |  | 1 |  | 1
Aggregate unpaid principal balance of CLO loans in default |  |  | 10 |  | 10
Variable interest entity, primary beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Aggregate fair value of investment in collateralized loan obligations |  |  | 245 |  | $ 266
New Collateralized Loan Obligation Entities |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Face value of liabilities issued by managed investment entities on issuance date | $ 406 | $ 511 |  |  |
Face amount of managed investment entities liabilities purchased by subsidiaries at issuance date | $ 36 | $ 45 |  |  |
Subordinated Debt Obligations | Variable interest entity, primary beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Aggregate fair value of investment in collateralized loan obligations |  |  | 126 |  |
Subordinated Debt Obligations | New collateralized loan obligation temporary warehousing entities |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Aggregate fair value of investment in collateralized loan obligations |  |  | $ 40 |  |

X
- Definition Aggregate unpaid principal balance of variable interest entity loans in default. + References No definition available. + Details
Name: | afg_AggregateUnpaidPrincipalBalanceOfVariableInterestEntityLoansInDefault
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date. + References No definition available. + Details
Name: | afg_AmountPaidBySubsidiariesToPurchaseManagedInvestmentEntitiesLiabilitiesAfterIssuanceDate.
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying amount of variable interest entity loans in default. + References No definition available. + Details
Name: | afg_CarryingAmountOfVariableInterestEntityLoansInDefault
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Difference between aggregate unpaid principal balance and fair value of variable interest entity debt. + References No definition available. + Details
Name: | afg_DifferenceBetweenAggregateUnpaidPrincipalBalanceAndFairValueOfVariableInterestEntityDebt
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Difference between aggregate unpaid principal balance and fair value of variable interest entity investments. + References No definition available. + Details
Name: | afg_DifferenceBetweenAggregateUnpaidPrincipalBalanceAndFairValueOfVariableInterestEntityInvestments
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date. + References No definition available. + Details
Name: | afg_FaceAmountOfManagedInvestmentEntitiesLiabilitiesPurchasedBySubsidiariesAfterIssuanceDate
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Face amount of managed investment entities liabilities purchased by subsidiaries at issuance date. + References No definition available. + Details
Name: | afg_FaceAmountOfManagedInvestmentEntitiesLiabilitiesPurchasedBySubsidiariesAtIssuanceDate
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Face value of liabilities issued by managed investment entities. + References No definition available. + Details
Name: | afg_FaceValueOfLiabilitiesIssuedByManagedInvestmentEntitiesOnIssuanceDate
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of collateralized loan obligation entities. + References No definition available. + Details
Name: | afg_NumberOfCollateralizedLoanObligationEntities
Namespace Prefix: | afg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of investment of most subordinate debt tranche of variable interest entity. + References No definition available. + Details
Name: | afg_PercentageOfInvestmentOfMostSubordinateDebtTrancheOfVariableInterestEntityMaximum
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum percentage of investment of most subordinate debt tranche of variable interest entity. + References No definition available. + Details
Name: | afg_PercentageOfInvestmentOfMostSubordinateDebtTrancheOfVariableInterestEntityMinimum
Namespace Prefix: | afg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds received by subsidiaries related to sales and redemptions of managed investment entities liabilities. + References No definition available. + Details
Name: | afg_ProceedsReceivedBySubsidiariesRelatedtoSalesandRedemptionsofManagedInvestmentEntitiesLiabilities
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5747-111685 + Details
Name: | us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=afg_NewCollateralizedLoanObligationEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_SubordinatedDebtObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=afg_NewCollateralizedLoanObligationTemporaryWarehousingEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |