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Subsequent Events - Narrative (Details) - USD ($)
Oct. 01, 2020
Oct. 13, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Subsequent Event [Line Items]                
Principal     $ 2,143,000,000   $ 1,493,000,000      
AOCI, other effects     1,233,000,000   863,000,000      
Accumulated Net Investment Gain (Loss) Attributable to Parent                
Subsequent Event [Line Items]                
AOCI, other effects     1,212,000,000 $ 1,030,000,000 862,000,000 $ 920,000,000 $ 812,000,000 $ 83,000,000
Subsequent event                
Subsequent Event [Line Items]                
Inforce annuity business ceded $ 6,000,000,000              
Inforce annuity business ceded, percent of total inforce annuity business 15.00%              
Subsequent event | Minimum                
Subsequent Event [Line Items]                
Expected life of ceded reserves 7 years              
Subsequent event | Minimum | Accumulated Net Investment Gain (Loss) Attributable to Parent                
Subsequent Event [Line Items]                
AOCI, other effects $ 275,000,000              
Subsequent event | Maximum                
Subsequent Event [Line Items]                
Expected life of ceded reserves 10 years              
Subsequent event | Maximum | Accumulated Net Investment Gain (Loss) Attributable to Parent                
Subsequent Event [Line Items]                
AOCI, other effects $ 300,000,000              
AFG | Subordinated Debentures                
Subsequent Event [Line Items]                
Principal     825,000,000   475,000,000      
AFG | Subordinated Debentures | 6% Subordinated Debentures due November 2055                
Subsequent Event [Line Items]                
Principal     $ 150,000,000   $ 150,000,000      
Interest rate on debt instruments     6.00%          
AFG | Subordinated Debentures | 6% Subordinated Debentures due November 2055 | Subsequent event                
Subsequent Event [Line Items]                
Principal   $ 150,000,000            
Interest rate on debt instruments   6.00%