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Long-Term Debt (Tables)
9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Schedule of long-term debt instruments
Long-term debt consisted of the following (in millions):
September 30, 2025December 31, 2024
PrincipalDiscount and Issue CostsCarrying ValuePrincipalDiscount and Issue CostsCarrying 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— — 
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