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Long-Term Debt - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Long-term Debt, Fiscal Year Maturity [Abstract]      
Scheduled principal payments on debt in 2017 $ 0 $ 0  
Scheduled principal payments on debt in 2018 0 0  
Scheduled principal payments on debt in 2019 350,000,000 350,000,000  
Scheduled principal payments on debt in 2020 0 0  
Scheduled principal payments on debt in 2021 0 0  
Scheduled principal payments on debt in 2022 0 0  
Scheduled principal payments on debt after 2022 958,000,000 958,000,000  
AFG      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Revolving credit line 500,000,000 500,000,000  
Amount borrowed under revolving credit facility $ 0 $ 0 $ 0
Interest rate description of fair value hedge activity   three-month LIBOR plus 8.099%  
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%    
Interest rate swaps | Fair Value Hedge | Designated as Hedging Instrument | AFG      
Debt Instrument [Line Items]      
Effective interest rate, percentage 9.2302% 9.2302% 9.0624%
Interest rate swaps | Fair Value Hedge | Designated as Hedging Instrument | LIBOR | AFG      
Debt Instrument [Line Items]      
Basis spread on variable interest rate 8.099% 8.099%  
Long-term debt | Interest rate swaps | Fair Value Hedge | Designated as Hedging Instrument | AFG      
Debt Instrument [Line Items]      
Net derivatives, at fair value     $ 1,000,000
Long-term debt | Interest rate swaps | Fair Value Hedge | Designated as Hedging Instrument | AFG | Maximum      
Debt Instrument [Line Items]      
Net derivatives, at fair value $ 1,000,000 $ 1,000,000  
Senior Notes | 9-7/8% Senior Notes due June 2019      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Stated interest rate, percentage 9.875% 9.875%  
Senior Notes | 9-7/8% Senior Notes due June 2019 | AFG      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Stated interest rate, percentage 9.875% 9.875% 9.875%
Senior Notes | 3.50% Senior Notes due August 2026 | AFG      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Stated interest rate, percentage 3.50% 3.50%  
Senior Notes | 6-3/8% Senior Notes due June 2042 | AFG      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Stated interest rate, percentage 6.375% 6.375%  
Senior Notes | 5-3/4% Senior Notes due August 2042 | AFG      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Stated interest rate, percentage 5.75% 5.75%  
Subordinated Debt | 6-1/4% Subordinated Debentures due September 2054 | AFG      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Stated interest rate, percentage 6.25% 6.25%  
Subordinated Debt | 6% Subordinated Debentures due November 2055 | AFG      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Stated interest rate, percentage 6.00% 6.00%