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Derivatives - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
swap
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
swap
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]          
Carrying value of collateral received to support purchased call options $ 375,000,000   $ 375,000,000   $ 380,000,000
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 7   7    
Notional amount of derivative instrument outstanding $ 991,000,000   $ 991,000,000   1,080,000,000
Gain (loss) reclassified from AOCI into net investment income 1,000,000 $ 1,000,000 3,000,000 $ 3,000,000  
Gain (loss) on cash flow hedge ineffectiveness recorded in Net Earnings 0 0 0 0  
Collateral receivable supporting interest rate swaps 60,000,000   60,000,000   60,000,000
Other assets | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivatives, at fair value 1,000,000   1,000,000   1,000,000
Other liabilities | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivatives, at fair value $ (20,000,000)   $ (20,000,000)   $ (22,000,000)
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 9.3446%   9.3446%   9.0624%
The net reduction in interest expense from interest rate swaps   $ 1,000,000 $ 1,000,000 $ 2,000,000  
AFG | Maximum | Fair Value Hedge | Designated as Hedging Instrument | Interest rate swaps          
Derivative Instruments, Gain (Loss) [Line Items]          
The net reduction in interest expense from interest rate swaps $ 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         $ 1,000,000
AFG | Long-term debt | Maximum | Fair Value Hedge | Designated as Hedging Instrument | Interest rate swaps          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivatives, at fair value $ 1,000,000   $ 1,000,000    
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%