XML 70 R58.htm IDEA: XBRL DOCUMENT
v3.25.1

Managed Investment Entities - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 28, 2025 USD ($) collateralized_loan_obligation | Feb. 29, 2024 USD ($) collateralized_loan_obligation | Mar. 31, 2025 USD ($) collateralized_loan_obligation | Dec. 31, 2024 USD ($) | Mar. 31, 2024 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of investment of most subordinate debt tranche, Minimum |  |  | 6.00% |  |
Percentage of investment of most subordinate debt tranche, Maximum |  |  | 100.00% |  |
Number of collateralized loan obligation entities | collateralized_loan_obligation |  |  | 13 |  |
Number of collateralized loan obligation entities formed during the period | collateralized_loan_obligation | 1 | 1 |  |  |
Number of collateralized loan obligation entities substantially liquidated during the period | collateralized_loan_obligation |  |  | 1 |  |
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments |  |  | $ 102 | $ 66 |
Difference between aggregate unpaid principal balance and carrying value of CLOs' debt |  |  | 209 | 172 |
Carrying amount of CLO loans in default |  |  | 3 |  |
Aggregate unpaid principal balance of variable interest entity loans in default |  |  | 7 | 5 |
Available for sale (AFS) fixed maturities |  |  | 10,568 | 10,398 |
Collateralized loan obligations |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Available for sale (AFS) fixed maturities |  |  | 1,241 | 1,237 |
Managed by third parties | Collateralized loan obligations |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Available for sale (AFS) fixed maturities |  |  | 1,240 | $ 1,240 |
Variable interest entity, primary beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment in CLO tranches |  |  | 122 |  |
Variable interest entity, primary beneficiary | Subordinated debt obligations |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment in CLO tranches |  |  | $ 112 |  |
New collateralized loan obligation entities |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Face value of liabilities issued by managed investment entities on issuance date | $ 406 | $ 406 |  |  |
Face amount of managed investment entities liabilities purchased at issuance date | $ 40 | $ 32 |  |  |
New collateralized loan obligation, temporary warehousing entities |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment in CLO tranches |  |  |  |  | $ 30

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 Number of collateralized loan obligation entities substantially liquidated during the period + References No definition available. + Details
Name: | afg_NumberOfCollateralizedLoanObligationEntitiesSubstantiallyLiquidatedDuringThePeriod
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-types1: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-types1: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/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + 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 -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481203/810-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 810 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481203/810-10-50-4 + 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 810 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481203/810-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 810 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481231/810-10-45-25 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 810 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (bb) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481203/810-10-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 810 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481231/810-10-45-25 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (b)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A + Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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: |

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: | srt_ConsolidatedEntitiesAxis=afg_NewCollateralizedLoanObligationEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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