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Derivatives - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
swap
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
swap
Sep. 30, 2015
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]            
Carrying value of collateral received to support purchased call options $ 300,000,000   $ 300,000,000     $ 211,000,000
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps            
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 $ 677,000,000   $ 677,000,000     614,000,000
Gain (loss) reclassified from AOCI into net investment income 2,000,000 $ 2,000,000 5,000,000 $ 4,000,000    
Gain (loss) on cash flow hedge ineffectiveness recorded in Net Earnings 0 0 0 0    
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps | Seven-year and nine-month interest rate swap            
Derivative Instruments, Gain (Loss) [Line Items]            
Notional amount of derivative instrument outstanding         $ 163,000,000  
Other assets | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps            
Derivative Instruments, Gain (Loss) [Line Items]            
Net derivatives, at fair value 14,000,000   14,000,000     2,000,000
Other liabilities | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps            
Derivative Instruments, Gain (Loss) [Line Items]            
Net derivatives, at fair value $ 0   $ 0      
Other liabilities | Maximum | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps            
Derivative Instruments, Gain (Loss) [Line Items]            
Net derivatives, at fair value           $ (1,000,000)
Senior Notes | 9-7/8% Senior Notes due June 2019            
Derivative Instruments, Gain (Loss) [Line Items]            
Stated interest rate, percentage 9.875%   9.875%      
AFG            
Derivative Instruments, Gain (Loss) [Line Items]            
Interest rate description of fair value hedge activity     three-month LIBOR plus 8.099%      
AFG | Fair Value Hedge | Designated as Hedging Instrument | Interest rate swaps            
Derivative Instruments, Gain (Loss) [Line Items]            
Effective interest rate, percentage 8.9493%   8.9493%     8.611%
The net reduction in interest expense from interest rate swaps $ 1,000,000 $ 1,000,000 $ 3,000,000 $ 1,000,000    
AFG | Long-term debt | Fair Value Hedge | Designated as Hedging Instrument | Interest rate swaps            
Derivative Instruments, Gain (Loss) [Line Items]            
Net derivatives, at fair value $ 6,000,000   $ 6,000,000     $ 2,000,000
AFG | Senior Notes | 9-7/8% Senior Notes due June 2019            
Derivative Instruments, Gain (Loss) [Line Items]            
Stated interest rate, percentage 9.875%   9.875%     9.875%
AFG | LIBOR | Fair Value Hedge | Designated as Hedging Instrument | Interest rate swaps            
Derivative Instruments, Gain (Loss) [Line Items]            
Basis spread on variable interest rate 8.099%   8.099%