XML 81 R59.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Fair Value Measurements - Changes in balances of Level 3 financial assets carried at fair value (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
May 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance |  | $ 3,706 | $ 3,841 | $ 3,521
Total realized/unrealized gains (losses) included in Net earnings |  | 181 | (42) | (10)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | (27) | 69 | 75
Purchases and issuances |  | 636 | 781 | 1,578
Sales and settlements |  | (565) | (606) | (565)
Transfer into Level 3 |  | 66 | 620 | 244
Transfer out of Level 3 |  | (352) | (957) | (1,002)
Sale of annuity business | $ (2,719) |  |  |
Financial assets, Ending Balance |  | 926 | 3,706 | 3,841
Fixed maturities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance |  | 538 | 571 | 542
Total realized/unrealized gains (losses) included in Net earnings |  | (3) | (7) | 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | (5) | 10 | 3
Purchases and issuances |  | 344 | 174 | 323
Sales and settlements |  | (210) | (157) | (131)
Transfer into Level 3 |  | 33 | 108 | 61
Transfer out of Level 3 |  | (97) | (161) | (228)
Sale of annuity business | 0 |  |  |
Financial assets, Ending Balance |  | 600 | 538 | 571
U.S. government agency |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance |  | 0 | 0 | 1
Total realized/unrealized gains (losses) included in Net earnings |  | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | 0 | 0 | 0
Purchases and issuances |  | 0 | 0 | 0
Sales and settlements |  | 0 | 0 | (1)
Transfer into Level 3 |  | 0 | 0 | 0
Transfer out of Level 3 |  | 0 | 0 | 0
Sale of annuity business | 0 |  |  |
Financial assets, Ending Balance |  | 0 | 0 | 0
State and municipal |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance |  | 39 | 40 | 0
Total realized/unrealized gains (losses) included in Net earnings |  | 0 | 0 | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | 0 | 1 | (1)
Purchases and issuances |  | 0 | 0 | 0
Sales and settlements |  | (4) | (2) | 0
Transfer into Level 3 |  | 8 | 0 | 45
Transfer out of Level 3 |  | (2) | 0 | (4)
Sale of annuity business | 0 |  |  |
Financial assets, Ending Balance |  | 41 | 39 | 40
Residential MBS |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance |  | 38 | 45 | 37
Total realized/unrealized gains (losses) included in Net earnings |  | (4) | (1) | 3
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | 0 | (1) | (1)
Purchases and issuances |  | 6 | 0 | 0
Sales and settlements |  | (3) | (6) | (3)
Transfer into Level 3 |  | 6 | 9 | 12
Transfer out of Level 3 |  | (29) | (8) | (3)
Sale of annuity business | 0 |  |  |
Financial assets, Ending Balance |  | 14 | 38 | 45
Commercial MBS |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance |  | 2 | 6 | 8
Total realized/unrealized gains (losses) included in Net earnings |  | 0 | 0 | 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | 0 | 0 | 0
Purchases and issuances |  | 0 | 0 | 0
Sales and settlements |  | 0 | 0 | 0
Transfer into Level 3 |  | 0 | 1 | 0
Transfer out of Level 3 |  | (2) | (5) | (3)
Sale of annuity business | 0 |  |  |
Financial assets, Ending Balance |  | 0 | 2 | 6
Collateralized loan obligations |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance |  | 16 | 1 | 31
Total realized/unrealized gains (losses) included in Net earnings |  | 1 | 0 | (1)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | 0 | 5 | 2
Purchases and issuances |  | 0 | 0 | 0
Sales and settlements |  | (2) | 0 | 0
Transfer into Level 3 |  | 0 | 52 | 3
Transfer out of Level 3 |  | (15) | (42) | (34)
Sale of annuity business | 0 |  |  |
Financial assets, Ending Balance |  | 0 | 16 | 1
Other asset-backed securities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance |  | 305 | 256 | 188
Total realized/unrealized gains (losses) included in Net earnings |  | 1 | (7) | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | 0 | 5 | 0
Purchases and issuances |  | 154 | 106 | 157
Sales and settlements |  | (156) | (89) | (43)
Transfer into Level 3 |  | 14 | 42 | 0
Transfer out of Level 3 |  | (40) | (8) | (46)
Sale of annuity business | 0 |  |  |
Financial assets, Ending Balance |  | 278 | 305 | 256
Corporate and other |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance |  | 138 | 223 | 277
Total realized/unrealized gains (losses) included in Net earnings |  | (1) | 1 | (2)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | (5) | 0 | 3
Purchases and issuances |  | 184 | 68 | 166
Sales and settlements |  | (45) | (60) | (84)
Transfer into Level 3 |  | 5 | 4 | 1
Transfer out of Level 3 |  | (9) | (98) | (138)
Sale of annuity business | 0 |  |  |
Financial assets, Ending Balance |  | 267 | 138 | 223
Equity securities |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance |  | 176 | 161 | 124
Total realized/unrealized gains (losses) included in Net earnings |  | 99 | (12) | (6)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | 0 | 0 | 0
Purchases and issuances |  | 78 | 37 | 19
Sales and settlements |  | (28) | (7) | (1)
Transfer into Level 3 |  | 0 | 9 | 25
Transfer out of Level 3 |  | (12) | (12) | 0
Sale of annuity business | 0 |  |  |
Financial assets, Ending Balance |  | 313 | 176 | 161
Assets of MIE |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance |  | 21 | 17 | 21
Total realized/unrealized gains (losses) included in Net earnings |  | 0 | (6) | (5)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | 0 | 0 | 0
Purchases and issuances |  | 5 | 2 | 1
Sales and settlements |  | 0 | 0 | 0
Transfer into Level 3 |  | 1 | 8 | 0
Transfer out of Level 3 |  | (14) | 0 | 0
Sale of annuity business | 0 |  |  |
Financial assets, Ending Balance |  | 13 | 21 | 17
Assets of discontinued annuity operations | Annuity subsidiaries |  |  |  |
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial assets, Beginning Balance |  | 2,971 | 3,092 | 2,834
Total realized/unrealized gains (losses) included in Net earnings |  | 85 | (17) | 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) |  | (22) | 59 | 72
Purchases and issuances |  | 209 | 568 | 1,235
Sales and settlements |  | (327) | (442) | (433)
Transfer into Level 3 |  | 32 | 495 | 158
Transfer out of Level 3 |  | (229) | (784) | (774)
Sale of annuity business | $ (2,719) |  |  |
Financial assets, Ending Balance |  | $ 0 | $ 2,971 | $ 3,092

X
- Definition Fair value measurement with unobservable inputs reconciliation, recurring basis, asset, disposition of subsidiaries + References No definition available. + Details
Name: | afg_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDispositionOfSubsidiaries
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_FixedMaturitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=afg_AssetsOfManagedInvestmentEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=afg_AssetsOfDiscontinuedAnnuityOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=afg_AnnuitySubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |