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Derivatives (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Indexed annuities as a percentage of annuity benefits 50.00%   50.00%  
Carrying value of collateral received to support purchased call options $ 265,000,000   $ 265,000,000  
Not Designated as Hedging Instrument [Member] | Interest rate swaptions [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount of derivative asset instrument outstanding 200,000,000   200,000,000  
Payments to purchase swaptions     4,000,000  
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Contract term of derivative instrument   5 years    
Notional amount of derivative instrument outstanding   $ 431,000,000    
Gain (loss) reclassified from AOCI into net investment income 1,000,000   2,000,000  
Gain (loss) on cash flow hedge ineffectiveness recorded in Net Earnings $ 0   0  
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Five-year interest rate swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Contract term of derivative instrument 5 years      
Notional amount of derivative instrument outstanding $ 195,000,000   195,000,000  
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Fifteen-year interest rate swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Contract term of derivative instrument 15 years      
Notional amount of derivative instrument outstanding $ 132,000,000   132,000,000  
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest rate swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount of derivative instrument outstanding 673,000,000   673,000,000 $ 401,000,000
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 (are less than in 2014) 1,000,000   1,000,000  
Other assets [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 (are less than in 2014)       $ 1,000,000
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 (are less than in 2014) $ (1,000,000)   $ (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 8.3847%   8.3847%  
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) $ 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 (are less than in 2014) $ 2,000,000   $ 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%  
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%