XML 82 R70.htm IDEA: XBRL DOCUMENT
v3.20.2

Long-Term Debt - Schedule of long-term debt (Details) - USD ($) | Sep. 30, 2020 | May 29, 2020 | Apr. 02, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Summary of Carrying value of long-term debt |  |  |  |
Principal | $ 2,143,000,000 |  |  | $ 1,493,000,000
Discount and Issue Costs | (35,000,000) |  |  | (20,000,000)
Carrying Value | 2,108,000,000 |  |  | 1,473,000,000
Senior Notes | AFG |  |  |  |
Summary of Carrying value of long-term debt |  |  |  |
Principal | 1,318,000,000 |  |  | 1,018,000,000
Discount and Issue Costs | (12,000,000) |  |  | (5,000,000)
Carrying Value | $ 1,306,000,000 |  |  | 1,013,000,000
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 | $ 590,000,000 |  |  | 590,000,000
Discount and Issue Costs | (2,000,000) |  |  | (2,000,000)
Carrying Value | $ 588,000,000 |  |  | 588,000,000
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 | $ 425,000,000 |  |  | 425,000,000
Discount and Issue Costs | (3,000,000) |  |  | (3,000,000)
Carrying Value | $ 422,000,000 |  |  | 422,000,000
Senior Notes | 5.25% Senior Notes due April 2030 | AFG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on debt instruments | 5.25% |  | 5.25% |
Summary of Carrying value of long-term debt |  |  |  |
Principal | $ 300,000,000 |  | $ 300,000,000 | 0
Discount and Issue Costs | (7,000,000) |  |  | 0
Carrying Value | 293,000,000 |  |  | 0
Senior Notes | Other | AFG |  |  |  |
Summary of Carrying value of long-term debt |  |  |  |
Principal | 3,000,000 |  |  | 3,000,000
Discount and Issue Costs | 0 |  |  | 0
Carrying Value | 3,000,000 |  |  | 3,000,000
Subordinated Debentures | AFG |  |  |  |
Summary of Carrying value of long-term debt |  |  |  |
Principal | 825,000,000 |  |  | 475,000,000
Discount and Issue Costs | (23,000,000) |  |  | (15,000,000)
Carrying Value | $ 802,000,000 |  |  | 460,000,000
Subordinated Debentures | 4.50% Subordinated Debentures due September 2060 | AFG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on debt instruments | 4.50% |  |  |
Summary of Carrying value of long-term debt |  |  |  |
Principal | $ 200,000,000 |  |  | 0
Discount and Issue Costs | (4,000,000) |  |  | 0
Carrying Value | $ 196,000,000 |  |  | 0
Subordinated Debentures | 5.125% Subordinate 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 | $ 200,000,000 |  |  | 200,000,000
Discount and Issue Costs | (6,000,000) |  |  | (6,000,000)
Carrying Value | $ 194,000,000 |  |  | 194,000,000
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 | $ 150,000,000 |  |  | 150,000,000
Discount and Issue Costs | (5,000,000) |  |  | (5,000,000)
Carrying Value | $ 145,000,000 |  |  | 145,000,000
Subordinated Debentures | 5.625% Subordinated Debentures due June 2060 | AFG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on debt instruments | 5.625% | 5.625% |  |
Summary of Carrying value of long-term debt |  |  |  |
Principal | $ 150,000,000 | $ 150,000,000 |  | 0
Discount and Issue Costs | (4,000,000) |  |  | 0
Carrying Value | $ 146,000,000 |  |  | 0
Subordinated Debentures | 5.875% Subordinated Debentures due March 2059 | AFG |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on debt instruments | 5.875% |  |  |
Summary of Carrying value of long-term debt |  |  |  |
Principal | $ 125,000,000 |  |  | 125,000,000
Discount and Issue Costs | (4,000,000) |  |  | (4,000,000)
Carrying Value | $ 121,000,000 |  |  | $ 121,000,000

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=120520924&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=120400017&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=120391452&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=120398452&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=120391452&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=120391452&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=119993939&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=120520924&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=120400017&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=120398452&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=120391452&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_SeniorNotesDueInApril2030Member
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_SubordinatedDebenturesDueInSeptember2060Member
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_SubordinatedDebenturesDueInJune2060Member
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: |