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Long-Term Debt (Tables) | 9 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Schedule of long-term debt instruments | Long-term debt consisted of the following (in millions):
| September 30, 2025 |  | December 31, 2024
| Principal |  | Discount and Issue Costs |  | Carrying Value |  | Principal |  | Discount and Issue Costs |  | Carrying Value
Direct Senior Obligations of AFG: |  |  |  |  |  |  |  |  |  |  |
4.50% Senior Notes due June 2047 | $ | 567 |  |  | $ | (1) |  |  | $ | 566 |  |  | $ | 567 |  |  | $ | (1) |  |  | $ | 566 |
5.00% Senior Notes due September 2035 | 350 |  |  | (6) |  |  | 344 |  |  | — |  |  | — |  |  | — |
5.25% Senior Notes due April 2030 | 253 |  |  | (3) |  |  | 250 |  |  | 253 |  |  | (4) |  |  | 249 |
Other | 3 |  |  | — |  |  | 3 |  |  | 3 |  |  | — |  |  | 3 |
| 1,173 |  |  | (10) |  |  | 1,163 |  |  | 823 |  |  | (5) |  |  | 818 |
Direct Subordinated Obligations of AFG: |  |  |  |  |  |  |  |  |  |  |
4.50% Subordinated Debentures due September 2060 | 200 |  |  | (5) |  |  | 195 |  |  | 200 |  |  | (5) |  |  | 195 |
5.125% Subordinated Debentures due December 2059 | 200 |  |  | (5) |  |  | 195 |  |  | 200 |  |  | (5) |  |  | 195 |
5.625% Subordinated Debentures due June 2060 | 150 |  |  | (4) |  |  | 146 |  |  | 150 |  |  | (4) |  |  | 146 |
5.875% Subordinated Debentures due March 2059 | 125 |  |  | (4) |  |  | 121 |  |  | 125 |  |  | (4) |  |  | 121 |
| 675 |  |  | (18) |  |  | 657 |  |  | 675 |  |  | (18) |  |  | 657 |
| $ | 1,848 |  |  | $ | (28) |  |  | $ | 1,820 |  |  | $ | 1,498 |  |  | $ | (23) |  |  | $ | 1,475 |

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