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Derivatives (Details Textual)
3 Months Ended
Mar. 31, 2016
USD ($)
swap
Mar. 31, 2015
USD ($)
Dec. 31, 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 $ 196,000,000   $ 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    
Notional amount of derivative instrument outstanding $ 749,000,000   614,000,000
Gain (loss) reclassified from AOCI into net investment income 2,000,000 $ 1,000,000  
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] | 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 13,000,000   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    
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%    
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 8.7329%   8.611%
The net reduction in interest expense from interest rate swaps $ 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 $ 8,000,000   $ 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%