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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 24 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Positive Outcome of Litigation [Member]
Sep. 30, 2012
Tax Litigation Settlement [Member]
Dec. 31, 2006
Tax Litigation Settlement [Member]
Gain Contingencies [Line Items]              
Period of discretionary appeal         90 days    
Income Taxes (Textual) [Abstract]              
Non-deductible losses related to managed investment entities $ 18   $ 64 $ 47      
Tax exempt income related to managed investment entities   8          
Tax litigation settlement           28  
Expected refund of tax and interest paid to the IRS             17
Decrease in the liability for unrecognized tax benefits 28   28        
Decrease in related accrued interest 13   13        
Change in AFG's liability for uncertain tax positions $ 10