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Long-Term Debt - Narrative (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
May 29, 2020
Apr. 02, 2020
Dec. 31, 2019
Long-term Debt, Fiscal Year Maturity [Abstract]        
Scheduled principal payments on debt remainder of fiscal year $ 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 in year six 0      
Principal 1,943,000,000     $ 1,493,000,000
AFG        
Long-term Debt, Fiscal Year Maturity [Abstract]        
Revolving credit line 500,000,000      
Amount borrowed under revolving credit facility $ 0     0
Interest rate description for revolving credit facility 1.00% to 1.875% (currently 1.375%) over LIBOR      
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%      
Senior Notes | AFG        
Long-term Debt, Fiscal Year Maturity [Abstract]        
Principal $ 1,318,000,000     1,018,000,000
Senior Notes | 5.25% Senior Notes due April 2030 | AFG        
Long-term Debt, Fiscal Year Maturity [Abstract]        
Principal $ 300,000,000   $ 300,000,000 0
Interest rate on debt instruments 5.25%   5.25%  
Subordinated Debentures | AFG        
Long-term Debt, Fiscal Year Maturity [Abstract]        
Principal $ 625,000,000     475,000,000
Subordinated Debentures | 5.625% Subordinated Debentures due June 2060 | AFG        
Long-term Debt, Fiscal Year Maturity [Abstract]        
Principal $ 150,000,000 $ 150,000,000   $ 0
Interest rate on debt instruments 5.625% 5.625%