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Fair Value Measurements (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
stock
Sep. 30, 2013
Sep. 30, 2014
professional
Sep. 30, 2013
Fair Value Measurements (Textual) [Abstract]        
AFG's internal investment professionals     20  
Number of stocks transferred from Level 1 to Level 2 0      
Level 3 assets as a percentage of total assets measured at fair value     3.00%  
Percentage of level 3 assets that were priced using non-binding broker quotes     85.00%  
Level 3 assets that were priced using non-binding broker quotes     $ 919  
Percentage of internally developed Level 3 asset fair values to Shareholders' equity     2.00%  
Total realized/unrealized gains (losses) included in net income on liabilities still outstanding 6 20 12 2
Maximum [Member]
       
Fair Value Measurements (Textual) [Abstract]        
Percentage of internally developed Level 3 asset fair values to total assets (are less than)     0.50%  
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 1,090   1,090  
Fixed-indexed annuities (embedded derivative) [Member] | Minimum [Member]
       
Fair Value Measurements (Textual) [Abstract]        
Unobservable input surrenders used in Level 3 fair value determination     4.00%  
Fixed-indexed annuities (embedded derivative) [Member] | Maximum [Member]
       
Fair Value Measurements (Textual) [Abstract]        
Unobservable input surrenders used in Level 3 fair value determination     16.00%  
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     6.00%  
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     12.00%  
Perpetual preferred stocks [Member]
       
Fair Value Measurements (Textual) [Abstract]        
Number of stocks transferred from Level 1 to Level 2   1 9 1
Number of stocks transferred from Level 2 to Level 1 14 6 14 10
Fair value of assets transferred from Level 1 to Level 2 55 10 55 10
Fair value of assets transferred from Level 2 to Level 1, during the period 96 46 96 46
Common stocks [Member]
       
Fair Value Measurements (Textual) [Abstract]        
Number of stocks transferred from Level 2 to Level 1   1   1
Fair value of assets transferred from Level 2 to Level 1, during the period   16   16
Redeemable preferred stocks [Member]
       
Fair Value Measurements (Textual) [Abstract]        
Number of stocks transferred from Level 2 to Level 1       1
Fair value of assets transferred from Level 2 to Level 1   $ 11   $ 11