XML 87 R66.htm IDEA: XBRL DOCUMENT
v3.20.1

Long-Term Debt - Schedule of long-term debt (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Summary of Carrying value of long-term debt |  |
Principal | $ 1,493 | $ 1,493
Discount and Issue Costs | (20) | (20)
Carrying Value | 1,473 | 1,473
Senior Notes | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 1,018 | 1,018
Discount and Issue Costs | (5) | (5)
Carrying Value | $ 1,013 | 1,013
Senior Notes | 4.50% Senior Notes due June 2047 | AFG |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instruments | 4.50% |
Summary of Carrying value of long-term debt |  |
Principal | $ 590 | 590
Discount and Issue Costs | (2) | (2)
Carrying Value | $ 588 | 588
Senior Notes | 3.50% Senior Notes due August 2026 | AFG |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instruments | 3.50% |
Summary of Carrying value of long-term debt |  |
Principal | $ 425 | 425
Discount and Issue Costs | (3) | (3)
Carrying Value | 422 | 422
Senior Notes | Other | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 3 | 3
Discount and Issue Costs | 0 | 0
Carrying Value | 3 | 3
Subordinated Debentures | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 475 | 475
Discount and Issue Costs | (15) | (15)
Carrying Value | $ 460 | 460
Subordinated Debentures | 5.125% Subordinated Debentures due December 2059 | AFG |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instruments | 5.125% |
Summary of Carrying value of long-term debt |  |
Principal | $ 200 | 200
Discount and Issue Costs | (6) | (6)
Carrying Value | $ 194 | 194
Subordinated Debentures | 6% Subordinated Debentures due November 2055 | AFG |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instruments | 6.00% |
Summary of Carrying value of long-term debt |  |
Principal | $ 150 | 150
Discount and Issue Costs | (5) | (5)
Carrying Value | $ 145 | 145
Subordinated Debentures | 5.875% Subordinated Debentures due in March 2059 | AFG |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instruments | 5.875% |
Summary of Carrying value of long-term debt |  |
Principal | $ 125 | 125
Discount and Issue Costs | (4) | (4)
Carrying Value | $ 121 | $ 121

X
- Definition Summary of Carrying value of long-term debt. + References No definition available. + Details
Name: | afg_SummaryOfCarryingValueOfLongTermDebtAbstract
Namespace Prefix: | afg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
Name: | us-gaap_DeferredFinanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=afg_SeniorNotesDueInJune2047Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=afg_SeniorNotesDueInAugust2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SubordinatedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=afg_SubordinatedDebenturesdueinDecember2059Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=afg_SubordinatedDebenturesDueInNovember2055Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=afg_SubordinatedDebenturesDueInMarch2059Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |