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Long-Term Debt - Schedule of long-term debt (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Jun. 03, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Summary of Carrying value of long-term debt |  |  |
Principal | $ 1,568 |  | $ 1,993
Discount and Issue Costs | (26) |  | (29)
Carrying Value | 1,542 |  | 1,964
Senior Notes | AFG |  |  |
Summary of Carrying value of long-term debt |  |  |
Principal | 893 |  | 1,318
Discount and Issue Costs | (7) |  | (10)
Carrying Value | $ 886 |  | 1,308
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% | 3.50% |
Summary of Carrying value of long-term debt |  |  |
Principal | $ 0 |  | 425
Discount and Issue Costs | 0 |  | (3)
Carrying Value | $ 0 |  | 422
Senior Notes | 5.25% Senior Notes due April 2030 | AFG |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on debt instruments | 5.25% |  |
Summary of Carrying value of long-term debt |  |  |
Principal | $ 300 |  | 300
Discount and Issue Costs | (5) |  | (5)
Carrying Value | 295 |  | 295
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 | 675 |  | 675
Discount and Issue Costs | (19) |  | (19)
Carrying Value | $ 656 |  | 656
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 |  | 200
Discount and Issue Costs | (5) |  | (5)
Carrying Value | $ 195 |  | 195
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 | 5.625% Subordinated Debentures due June 2060 | AFG |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on debt instruments | 5.625% |  |
Summary of Carrying value of long-term debt |  |  |
Principal | $ 150 |  | 150
Discount and Issue Costs | (4) |  | (4)
Carrying Value | $ 146 |  | 146
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 |  | 125
Discount and Issue Costs | (4) |  | (4)
Carrying Value | $ 121 |  | $ 121

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- 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 https://asc.fasb.org/extlink&oid=123466204&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 https://asc.fasb.org/extlink&oid=126734703&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 https://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 https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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