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Long-Term Debt - Schedule of long-term debt (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Summary of Carrying value of long-term debt |  |
Principal | $ 1,498 | $ 1,521
Discount and Issue Costs | (23) | (25)
Carrying Value | 1,475 | 1,496
AFG |  |
Summary of Carrying value of long-term debt |  |
Carrying Value | 1,475 | 1,496
Senior Notes | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 823 | 846
Discount and Issue Costs | (5) | (6)
Carrying Value | 818 | 840
Senior Notes | 4.50% Senior Notes due June 2047 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | 567 | 582
Discount and Issue Costs | (1) | (1)
Carrying Value | $ 566 | $ 581
Interest rate on debt instruments | 4.50% | 4.50%
Senior Notes | 5.25% Senior Notes due April 2030 | AFG |  |
Summary of Carrying value of long-term debt |  |
Principal | $ 253 | $ 261
Discount and Issue Costs | (4) | (5)
Carrying Value | $ 249 | $ 256
Interest rate on debt instruments | 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) | (19)
Carrying Value | 657 | 656
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) | (6)
Carrying Value | $ 195 | 194
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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