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Long-Term Debt - Schedule of long-term debt (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Summary of Carrying value of long-term debt |  |  |
Principal | $ 1,498 | $ 1,498 |
Discount and Issue Costs | (23) | (23) |
Carrying Value | 1,475 | 1,475 |
AFG |  |  |
Summary of Carrying value of long-term debt |  |  |
Carrying Value | 1,475 | 1,475 |
Senior Notes | AFG |  |  |
Summary of Carrying value of long-term debt |  |  |
Principal | 823 | 823 |
Discount and Issue Costs | (5) | (5) |
Carrying Value | 818 | 818 |
Senior Notes | 4.50% Senior Notes due June 2047 | AFG |  |  |
Summary of Carrying value of long-term debt |  |  |
Principal | 567 | 567 |
Discount and Issue Costs | (1) | (1) |
Carrying Value | $ 566 | $ 566 |
Interest rate on debt instruments | 4.50% | 4.50% | 4.50%
Senior Notes | 5.25% Senior Notes due April 2030 | AFG |  |  |
Summary of Carrying value of long-term debt |  |  |
Principal | $ 253 | $ 253 |
Discount and Issue Costs | (4) | (4) |
Carrying Value | $ 249 | $ 249 |
Interest rate on debt instruments | 5.25% | 5.25% | 5.25%
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 | (18) | (18) |
Carrying Value | 657 | 657 |
Subordinated Debentures | 4.50% Subordinated Debentures due September 2060 | AFG |  |  |
Summary of Carrying value of long-term debt |  |  |
Principal | 200 | 200 |
Discount and Issue Costs | (5) | (5) |
Carrying Value | $ 195 | 195 |
Interest rate on debt instruments | 4.50% |  |
Subordinated Debentures | 5.125% Subordinated Debentures due December 2059 | AFG |  |  |
Summary of Carrying value of long-term debt |  |  |
Principal | $ 200 | 200 |
Discount and Issue Costs | (5) | (5) |
Carrying Value | $ 195 | 195 |
Interest rate on debt instruments | 5.125% |  |
Subordinated Debentures | 5.625% Subordinated Debentures due June 2060 | AFG |  |  |
Summary of Carrying value of long-term debt |  |  |
Principal | $ 150 | 150 |
Discount and Issue Costs | (4) | (4) |
Carrying Value | $ 146 | 146 |
Interest rate on debt instruments | 5.625% |  |
Subordinated Debentures | 5.875% Subordinated Debentures due March 2059 | AFG |  |  |
Summary of Carrying value of long-term debt |  |  |
Principal | $ 125 | 125 |
Discount and Issue Costs | (4) | (4) |
Carrying Value | $ 121 | $ 121 |
Interest rate on debt instruments | 5.875% |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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