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Long-Term Debt - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Long-term Debt, Fiscal Year Maturity [Abstract]      
Scheduled principal payments on debt remainder of fiscal year $ 0    
Scheduled principal payments on debt in year one 0    
Scheduled principal payments on debt in year two 0    
Scheduled principal payments on debt in year three 0    
Scheduled principal payments on debt in year four 0    
Scheduled principal payments on debt in year five 0    
Scheduled principal payments on debt thereafter 1,500,000,000    
AFG      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Revolving credit line 500,000,000    
Amount borrowed under revolving credit facility 0 $ 0  
AFG | 4.50% Senior Notes due June 2047 | Senior Notes      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Face amount of debt repurchased $ 15,000,000    
Interest rate on debt instruments 4.50%    
Amount of debt repurchased $ 13,000,000    
AFG | 5.25% Senior Notes due April 2030 | Senior Notes      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Face amount of debt repurchased $ 3,000,000    
Interest rate on debt instruments 5.25%    
Amount of debt repurchased $ 3,000,000    
AFG | 3.50% Senior Notes due August 2026 | Senior Notes      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Face amount of debt repurchased     $ 48,000,000
Interest rate on debt instruments     3.50%
Amount of debt repurchased     $ 50,000,000
LIBOR | AFG      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Interest rate on revolving debt facility 1.375%    
LIBOR | AFG | Minimum      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Interest rate on revolving debt facility 1.00%    
LIBOR | AFG | Maximum      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Interest rate on revolving debt facility 1.875%