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Long-Term Debt (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
AFG [Member]
Dec. 31, 2012
AFG [Member]
Dec. 31, 2012
AFG [Member]
Minimum [Member]
Dec. 31, 2012
AFG [Member]
Maximum [Member]
Dec. 31, 2012
National Interstate [Member]
Nov. 30, 2012
National Interstate [Member]
Dec. 31, 2012
National Interstate [Member]
Maximum [Member]
Nov. 30, 2012
National Interstate [Member]
Line of Credit [Member]
Dec. 31, 2012
9-7/8% Senior Notes due June 2019 [Member]
Dec. 31, 2012
6-3/8% Senior Notes due June 2042 [Member]
Jun. 30, 2012
6-3/8% Senior Notes due June 2042 [Member]
AFG [Member]
Dec. 31, 2012
5-3/4% Senior Notes due August 2042 [Member]
Aug. 31, 2012
5-3/4% Senior Notes due August 2042 [Member]
AFG [Member]
Dec. 31, 2012
7% Senior Notes due September 2050 [Member]
Dec. 31, 2012
7-1/8% Senior Debentures due February 2034 [Member]
Dec. 31, 2012
7-1/2% Senior Debentures due November 2033 [Member]
Dec. 31, 2012
7-1/4% Senior Debentures due January 2034 [Member]
Debt Instrument [Line Items]                                        
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 12                                      
Line of credit, term       4 years             5 years                  
Revolving credit line       500 500       50   100                  
Interest rate on revolving debt facility       1.375% 1.375% 1.00% 1.875% 1.186%   0.875%                    
Amount borrowed under AFG revolving credit facility       0 0                              
Loans payable under National Interstate bank credit facility               12                        
Proceeds from Issuance of Senior Long-term Debt                           230   125        
Cash interest payments on long-term debt 75 74 68                                  
Interest expense credited on funds held by AFG’s insurance subsidiaries under reinsurance contracts and other similar agreements 9 10 10                                  
Interest rate description for revolving credit facility         1.00% to 1.875% (currently 1.375%) over LIBOR     LIBOR plus 0.875% (currently 1.186%)                        
Interest rate on debt instruments                       9.875% 6.375%   5.75%   7.00% 7.125% 7.50% 7.25%
Secured borrowings guaranteed by AFG $ 16 $ 17