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Derivatives (Details Textual)
3 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
swap
Sep. 30, 2014
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2015
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]            
Indexed annuities as a percentage of annuity benefits     60.00%      
Carrying value of collateral received to support purchased call options     $ 211,000,000 $ 285,000,000    
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] | Senior Notes [Member] | 9-7/8% Senior Notes due June 2019 [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Stated interest rate, percentage     9.875%      
Not Designated as Hedging Instrument [Member] | Fixed-indexed annuities (embedded derivative) [Member] | Annuity benefits [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
The portion of the change in fair value of the embedded derivative related to the unlocking of actuarial assumptions     $ (28,000,000) 58,000,000 $ 2,000,000  
Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Cash Flow Hedges [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Notional amount of derivative instrument outstanding     614,000,000 401,000,000    
Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Cash Flow Hedges [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Number of interest rate swaps entered into during the period | swap 2          
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     6,000,000 2,000,000    
Gain (loss) on cash flow hedge ineffectiveness recorded in Net Earnings     0 0    
Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Cash Flow Hedges [Member] | Other assets [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Net derivatives, at fair value (are less than in 2014)     2,000,000      
Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Cash Flow Hedges [Member] | Other assets [Member] | Maximum [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Net derivatives, at fair value (are less than in 2014)       1,000,000    
Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Cash Flow Hedges [Member] | Other liabilities [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Net derivatives, at fair value (are less than in 2014)       $ 0    
Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Cash Flow Hedges [Member] | Other liabilities [Member] | Maximum [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Net derivatives, at fair value (are less than in 2014)     $ (1,000,000)      
Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Cash Flow Hedges [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          
Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Cash Flow Hedges [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          
Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Fair Value Hedge [Member] | AFG [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Effective interest rate, percentage     8.611%      
The net reduction in interest expense from interest rate swaps     $ 2,000,000      
Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Fair Value Hedge [Member] | AFG [Member] | LIBOR [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Basis spread on variable interest rate     8.099%      
Designated as Hedging Instrument [Member] | Interest rate swaps [Member] | Fair Value Hedge [Member] | Long-term debt [Member] | AFG [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Net derivatives, at fair value (are less than in 2014)     $ 2,000,000