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Long-Term Debt (Details Textual) (USD $)
In Millions, unless otherwise specified
6 Months Ended 1 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Minimum [Member]
Jun. 30, 2012
Maximum [Member]
Jun. 30, 2012
9-7/8% Senior Notes due June 2019 [Member]
Jun. 30, 2012
6-3/8% Senior Notes due June 2042 [Member]
Jun. 30, 2012
6-3/8% Senior Notes due June 2042 [Member]
AFG [Member]
Jun. 30, 2012
7% Senior Notes due September 2050 [Member]
Jun. 30, 2012
7-1/2% Senior Debentures due November 2033 [Member]
Jun. 30, 2012
7-1/4% Senior Debentures due January 2034 [Member]
Jun. 30, 2012
7-1/8% Senior Debentures due February 2034 [Member]
Debt Instrument [Line Items]                      
Interest rate on debt instruments         9.875% 6.375%   7.00% 7.50% 7.25% 7.125%
Interest rate on revolving debt facility 2.00%   1.75% 3.00%              
Proceeds from Issuance of Senior Long-term Debt             $ 230        
Long-Term Debt (Textual) [Abstract]                      
Secured Borrowings guaranteed by AFG 16 17                  
Scheduled principal payments on debt in 2012 28                    
Scheduled principal payments on debt in 2013 20                    
Scheduled principal payments on debt in 2014 2                    
Scheduled principal payments on debt in 2015 14                    
Scheduled principal payments on debt in 2016 45                    
Scheduled principal payments on debt in 2017 0                    
AFG's revolving credit line 500                    
Interest rate range for revolving credit facility 1.75% to 3.00% (currently 2%) over LIBOR                    
Amount borrowed under AFG revolving credit facility $ 0