XML 96 R74.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Managed Investment Entities - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) collateralizedloanobligation | Dec. 31, 2020 USD ($) collateralizedloanobligation
Variable Interest Entity [Line Items] |  |
Percentage of investment of most subordinate debt tranche, Minimum | 4.50% |
Percentage of investment of most subordinate debt tranche, Maximum | 46.80% |
Number of collateralized loan obligation entities | collateralizedloanobligation | 13 |
Number of collateralized loan obligation entities formed during the period | collateralizedloanobligation |  | 1
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments | $ 72 | $ 150
Difference between aggregate unpaid principal balance and fair value of CLOs' debt | 187 | 141
Carrying amount of CLO loans in default | 9 | 11
Aggregate unpaid principal balance of CLO loans in default | 18 | 28
Available for sale (AFS) fixed maturities | 10,357 | 9,084
New collateralized loan obligation entities |  |
Variable Interest Entity [Line Items] |  |
Face value of liabilities issued by managed investment entities on issuance date | 408 | 303
Face amount of managed investment entities liabilities purchased by subsidiaries at issuance date | 14 | 16
Variable interest entity, primary beneficiary |  |
Variable Interest Entity [Line Items] |  |
Aggregate fair value of investment in collateralized loan obligations | 76 |
Subordinated debt obligations | Variable interest entity, primary beneficiary |  |
Variable Interest Entity [Line Items] |  |
Aggregate fair value of investment in collateralized loan obligations | 56 |
Collateralized loan obligations |  |
Variable Interest Entity [Line Items] |  |
Available for sale (AFS) fixed maturities | 1,643 | 1,062
Collateralized loan obligations | Managed by third parties |  |
Variable Interest Entity [Line Items] |  |
Available for sale (AFS) fixed maturities | $ 1,640 | $ 1,060

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 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 at issuance date. + References No definition available. + Details
Name: | afg_FaceAmountOfManagedInvestmentEntitiesLiabilitiesPurchasedAtIssuanceDate
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 Number of collateralized loan obligation entities formed during the period. + References No definition available. + Details
Name: | afg_NumberOfCollateralizedLoanObligationEntitiesFormedDuringThePeriod
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: | dtr-types: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: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123419778&loc=d3e5747-111685 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=123419778&loc=d3e5728-111685 + 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: | srt_ConsolidatedEntitiesAxis=afg_NewCollateralizedLoanObligationEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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