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Fair Value Measurements (Details Textual)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
stock
Jun. 30, 2015
USD ($)
stock
Mar. 31, 2015
USD ($)
Jun. 30, 2016
USD ($)
stock
professional
Jun. 30, 2015
USD ($)
stock
Dec. 31, 2015
USD ($)
Fair Value Measurements (Textual) [Abstract]            
AFG's internal investment professionals | professional       25    
Number of stocks transferred from Level 1 to Level 2 | stock   0     0  
Level 3 assets as a percentage of total assets measured at fair value       4.00%    
Percentage of level 3 assets that were priced using non-binding broker quotes       77.00%    
Level 3 assets that were priced using non-binding broker quotes       $ 1,330    
Life contingent annuities $ 200     $ 200   $ 200
Maximum [Member]            
Fair Value Measurements (Textual) [Abstract]            
Percentage of internally developed Level 3 asset fair values to Shareholders' equity (are less than)       10.00%    
Fixed-indexed annuties (embedded derivative), majority of future years [Member] | Minimum [Member]            
Fair Value Measurements (Textual) [Abstract]            
Unobservable input surrenders used in Level 3 fair value determination       5.00%    
Fixed-indexed annuties (embedded derivative), majority of future years [Member] | Maximum [Member]            
Fair Value Measurements (Textual) [Abstract]            
Unobservable input surrenders used in Level 3 fair value determination       10.00%    
Fixed-indexed annuities (embedded derivative) [Member]            
Fair Value Measurements (Textual) [Abstract]            
Fair value of derivatives in annuity benefits accumulated measured using a discounted cash flow approach $ 1,560     $ 1,560    
Fixed-indexed annuities (embedded derivative) [Member] | Minimum [Member]            
Fair Value Measurements (Textual) [Abstract]            
Unobservable input surrenders used in Level 3 fair value determination       3.00%    
Fixed-indexed annuities (embedded derivative) [Member] | Maximum [Member]            
Fair Value Measurements (Textual) [Abstract]            
Unobservable input surrenders used in Level 3 fair value determination       21.00%    
Common stocks [Member]            
Fair Value Measurements (Textual) [Abstract]            
Number of stocks transferred from Level 2 to Level 1 | stock   5     6  
Fair value of assets transferred from Level 2 to Level 1, during the second quarter   $ 26        
Fair value of assets transferred from Level 2 to Level 1, during the first six months   $ 79     $ 79  
Perpetual preferred stocks [Member]            
Fair Value Measurements (Textual) [Abstract]            
Number of stocks transferred from Level 2 to Level 1 | stock 5 2   6 4  
Fair value of assets transferred from Level 2 to Level 1, during the second quarter $ 27 $ 14        
Fair value of assets transferred from Level 2 to Level 1, during the first six months $ 35 $ 19   $ 35 $ 19  
Number of stocks transferred from Level 1 to Level 2 | stock 2     5    
Fair value of assets transferred from Level 1 to Level 2, during the second quarter $ 6          
Fair value of assets transferred from Level 1 to Level 2, during the first six months $ 12     $ 12    
Mandatorily redeemable preferred stocks [Member]            
Fair Value Measurements (Textual) [Abstract]            
Number of stocks transferred from Level 2 to Level 1 | stock   1     1  
Fair value of assets transferred from Level 2 to Level 1, during the second quarter   $ 10        
Fair value of assets transferred from Level 2 to Level 1, during the first six months   $ 10     $ 10  
Run-off long-term care insurance business [Member]            
Fair Value Measurements (Textual) [Abstract]            
Estimated sale proceeds of the run-off long-term care insurance business     $ 14