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Derivatives (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
swap
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
swap
Jun. 30, 2015
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]            
Carrying value of collateral received to support purchased call options $ 224,000,000   $ 224,000,000     $ 211,000,000
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Number of interest rate swaps designated and qualifying as a cash flow hedges | swap 4   4      
Notional amount of derivative instrument outstanding $ 711,000,000   $ 711,000,000     614,000,000
Gain (loss) reclassified from AOCI into net investment income 1,000,000 $ 1,000,000 3,000,000 $ 2,000,000    
Gain (loss) on cash flow hedge ineffectiveness recorded in Net Earnings 0 $ 0 0 0    
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Seven-year and nine-month interest rate swap [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Notional amount of derivative instrument outstanding         $ 163,000,000  
Other assets [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Net derivatives, at fair value 18,000,000   18,000,000     2,000,000
Other liabilities [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Net derivatives, at fair value $ 0   $ 0      
Other liabilities [Member] | Maximum [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Net derivatives, at fair value           $ (1,000,000)
Senior Notes [Member] | 9-7/8% Senior Notes due June 2019 [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Stated interest rate, percentage 9.875%   9.875%      
AFG [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Interest rate description of fair value hedge activity     three-month LIBOR plus 8.099%      
AFG [Member] | Fair Value Hedge [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Effective interest rate, percentage 8.7515%   8.7515%     8.611%
The net reduction in interest expense from interest rate swaps (are less than in 2015) $ 1,000,000   $ 2,000,000      
AFG [Member] | Maximum [Member] | Fair Value Hedge [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
The net reduction in interest expense from interest rate swaps (are less than in 2015)       $ 1,000,000    
AFG [Member] | Long-term debt [Member] | Fair Value Hedge [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Net derivatives, at fair value $ 9,000,000   $ 9,000,000     $ 2,000,000
AFG [Member] | Senior Notes [Member] | 9-7/8% Senior Notes due June 2019 [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Stated interest rate, percentage 9.875%   9.875%     9.875%
AFG [Member] | LIBOR [Member] | Fair Value Hedge [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Basis spread on variable interest rate 8.099%   8.099%