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Derivatives - Narrative (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
swap
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Carrying value of collateral received to support purchased call options $ 380,000,000 $ 211,000,000    
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 | Senior Notes | 9-7/8% Senior Notes due June 2019        
Derivative Instruments, Gain (Loss) [Line Items]        
Stated interest rate, percentage 9.875% 9.875%    
Not Designated as Hedging Instrument | Fixed-indexed annuities (embedded derivative) | Annuity benefits        
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 $ (17,000,000) $ (28,000,000) $ 58,000,000  
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount of derivative instrument outstanding $ 1,080,000,000.00 604,000,000    
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Number of interest rate swaps designated and qualifying as a cash flow hedges | swap 7      
Number of interest rate swaps entered into during the period | swap 4      
Gain (loss) reclassified from AOCI into net investment income $ 7,000,000 6,000,000    
Collateral receivable supporting interest rate swaps 60,000,000 14,000,000    
Gain (loss) on cash flow hedge ineffectiveness recorded in Net Earnings 0 0    
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges | Other assets        
Derivative Instruments, Gain (Loss) [Line Items]        
Net derivatives, at fair value 1,000,000 2,000,000    
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges | Other liabilities        
Derivative Instruments, Gain (Loss) [Line Items]        
Net derivatives, at fair value 22,000,000      
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges | Other liabilities | Maximum        
Derivative Instruments, Gain (Loss) [Line Items]        
Net derivatives, at fair value   $ (1,000,000)    
Designated as Hedging Instrument | Interest rate swaps | Cash Flow Hedges | New interest rate swaps entered into during the period        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount of derivative instrument outstanding $ 610,000,000      
Designated as Hedging Instrument | Interest rate swaps | Fair Value Hedge | AFG        
Derivative Instruments, Gain (Loss) [Line Items]        
Effective interest rate, percentage 9.0624% 8.611%    
The net reduction in interest expense from interest rate swaps $ 3,000,000 $ 2,000,000    
Designated as Hedging Instrument | Interest rate swaps | Fair Value Hedge | AFG | LIBOR        
Derivative Instruments, Gain (Loss) [Line Items]        
Basis spread on variable interest rate 8.099%      
Designated as Hedging Instrument | Interest rate swaps | Fair Value Hedge | Long-term debt | AFG        
Derivative Instruments, Gain (Loss) [Line Items]        
Net derivatives, at fair value $ 1,000,000 $ 2,000,000