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Insurance (Details Textual) - USD ($)
12 Months Ended
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Insurance [Line Items]        
Carrying value of cash and securities owned by U.S.-based insurance subsidiaries on deposit   $ 1,000,000,000    
Carrying value of cash and securities owned by insurance subsidiaries on deposit in support of underwriting activities at Lloyd's   203,000,000    
Undrawn letters of credit   307,000,000    
Undrawn letters of credit, collateralized   $ 0    
Workers' compensation insurance discount rate   4.50% 4.50%  
Workers' compensation insurance discount, which has reduced the liability for unpaid losses and loss adjustment expenses   $ 18,000,000 $ 19,000,000  
Long-term care insurance reserves, net of reinsurance recoverables   34,000,000    
Investment in Federal Home Loan Bank capital stock   41,000,000    
Proceeds received under funding agreements with the Federal Home Loan Bank   345,000,000    
Advances from Federal Home Loan Bank   $ 785,000,000 440,000,000  
Description of variable rate basis   LIBOR    
Estimated fair value of commercial mortgage-backed securities held as collateral by the Federal Home Loan Bank   $ 912,000,000    
Interest on advances from Federal Home Loan Bank   3,000,000 1,000,000 $ 1,000,000
Maximum amount of dividends available to be paid by insurance subsidiaries to AFG without prior approval of regulatory authorities   809,000,000    
Dividends on Common Stock   (178,000,000) (169,000,000) (161,000,000)
Catastrophe bonds   0 59,000,000  
Aggregate guaranteed minimum death benefit value on variable annuity polices in force   27,000,000 23,000,000  
Minimum [Member]        
Insurance [Line Items]        
Dividends payments without violating the most restrictive debt covenants, minimum   $ 1,000,000,000    
Minimum [Member] | LIBOR [Member]        
Insurance [Line Items]        
FHLB advances, basis spread on variable rate   0.02%    
Maximum [Member]        
Insurance [Line Items]        
Death benefits paid in excess of the variable annuity account balances (are less than in 2013, 2014 and 2015)   $ 1,000,000 1,000,000 1,000,000
Maximum [Member] | LIBOR [Member]        
Insurance [Line Items]        
FHLB advances, basis spread on variable rate   0.49%    
Average [Member] | LIBOR [Member]        
Insurance [Line Items]        
FHLB advances, basis spread on variable rate   0.58%    
Property and Casualty Insurance [Member]        
Insurance [Line Items]        
Special charges to increase asbestos and environmental reserves   $ 67,000,000 24,000,000 54,000,000
Catastrophe Bonds [Member]        
Insurance [Line Items]        
Catastrophe reinsurance coverage, excess retention amount $ 95,000,000      
Catastrophe reinsurance coverage, retention amount   119,000,000    
Catastrophe reinsurance coverage, annual cost   5,000,000    
Life insurance [Member]        
Insurance [Line Items]        
Life insurance in force, ceded premiums   11,190,000,000 12,700,000,000  
Life insurance in force, direct premiums   14,670,000,000 16,710,000,000  
Life written premiums ceded   40,000,000 41,000,000 44,000,000
Reinsurance recoveries   $ 50,000,000 59,000,000 $ 58,000,000
Run-off Long-term Care and Life [Member]        
Insurance [Line Items]        
Pretax charge on closed block of long-term care insurance     $ 0  
Unaffiliated Entity [Member] | Catastrophe Bonds [Member]        
Insurance [Line Items]        
Catastrophe bonds $ 95,000,000