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Insurance - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Insurance [Line Items]                
Carrying value of cash and securities owned by U.S.-based insurance subsidiaries on deposit $ 1,060         $ 1,060    
Carrying value of cash and securities owned by insurance subsidiaries on deposit in support of underwriting activities at Lloyd's 118         118    
Undrawn letters of credit 296         296    
Undrawn letters of credit, collateralized 0         $ 0    
Workers' compensation insurance discount rate           4.50% 4.50%  
Workers' compensation insurance discount, which has reduced the liability for unpaid losses and loss adjustment expenses 13   $ 15     $ 13 $ 15  
Long-term care insurance reserves, net of reinsurance recoverables 45   39     45 39  
Investment in Federal Home Loan Bank capital stock 47         47    
Advances from Federal Home Loan Bank 1,100         $ 1,100    
Proceeds from Federal Home Loan Bank Advance, Investing Activities 225              
Description of variable rate basis           LIBOR    
Repayments of advances from Federal Home Loan Bank due in next twelve months 445         $ 445    
Repayments of advances from Federal Home Loan Bank due in year two 40         40    
Repayments of advances from Federal Home Loan Bank due in year three 611         611    
Fair value of fixed maturity investments held as collateral by the Federal Home Loan Bank 1,280         1,280    
Interest on advances from Federal Home Loan Bank           20 14 $ 8
Maximum amount of dividends available to be paid by insurance subsidiaries to AFG without prior approval of regulatory authorities 1,300         1,300    
Dividends on common stock           (397) (421) (187)
Aggregate guaranteed minimum death benefit value on variable annuity polices in force 35   15     $ 35 15  
Minimum | LIBOR                
Insurance [Line Items]                
FHLB advances, basis spread on variable rate           0.15%    
Maximum                
Insurance [Line Items]                
Dividends payments without violating the most restrictive debt covenants, minimum 2,000         $ 2,000    
Maximum | LIBOR                
Insurance [Line Items]                
FHLB advances, basis spread on variable rate           0.24%    
Average | LIBOR                
Insurance [Line Items]                
FHLB advances, basis spread on variable rate           2.68%    
FHLB, advances, refinanced terms                
Insurance [Line Items]                
Advances from Federal Home Loan Bank 40   831     $ 40 831  
Catastrophe Bonds                
Insurance [Line Items]                
Catastrophe reinsurance coverage, excess retention percentage           95.00%    
Catastrophe reinsurance coverage, excess retention amount           $ 200    
Catastrophe reinsurance coverage, retention amount           104    
Catastrophe reinsurance coverage, annual cost           11    
Life insurance                
Insurance [Line Items]                
Increased statutory surplus resulting from reinsurance treaty 2,701   2,132     2,701 2,132  
Life insurance in force, ceded premiums 7,690   8,320     7,690 8,320  
Life insurance in force, direct premiums 10,820   12,050     10,820 12,050  
Reinsurance ceded           22 28 31
Reinsurance recoveries           38 35 41
Variable annuities | Maximum                
Insurance [Line Items]                
Death benefits paid in excess of the variable annuity account balances (are less than in 2016, 2017 and 2018)           1 1 1
Property and casualty insurance | Other lines                
Insurance [Line Items]                
Special charges to increase asbestos and environmental reserves   $ 18   $ 89   18 89 36
Favorable reserve development related to certain lines of business within subsidiaries in connection with a reinsurance to close agreement             $ 18  
Special charges related to the exit of certain lines of business within subsidiaries               65
Property and casualty insurance | Other lines | Increased insurance loss reserves related to medical malpractice and general liability lines                
Insurance [Line Items]                
Special charges related to the exit of certain lines of business within subsidiaries         $ 57      
Neon Capital Limited | Property and casualty insurance                
Insurance [Line Items]                
Favorable reserve development related to certain lines of business within subsidiaries in connection with a reinsurance to close agreement     42          
Neon Capital Limited | Property and casualty insurance | Other lines                
Insurance [Line Items]                
Favorable reserve development related to certain lines of business within subsidiaries in connection with a reinsurance to close agreement     18          
Special charges related to the exit of certain lines of business within subsidiaries               $ 65
Neon Capital Limited | Property and casualty insurance | Other lines | Reinsurance to close agreement                
Insurance [Line Items]                
Favorable reserve development related to certain lines of business within subsidiaries in connection with a reinsurance to close agreement     18          
Neon Capital Limited | Neon Capital Limited | Current lines                
Insurance [Line Items]                
Favorable reserve development related to certain lines of business within subsidiaries in connection with a reinsurance to close agreement     $ 24          
Great American Life Insurance Company | Life insurance                
Insurance [Line Items]                
Increased statutory surplus resulting from reinsurance treaty $ 510         $ 510