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Long-Term Debt (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
AFG [Member]
Dec. 31, 2013
AFG [Member]
Dec. 31, 2012
AFG [Member]
Dec. 31, 2013
AFG [Member]
Minimum [Member]
Dec. 31, 2013
AFG [Member]
Maximum [Member]
Dec. 31, 2013
National Interstate [Member]
Dec. 31, 2013
National Interstate [Member]
Dec. 31, 2013
National Interstate [Member]
Maximum [Member]
Dec. 31, 2013
9-7/8% Senior Notes due June 2019 [Member]
Dec. 31, 2013
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, 2013
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, 2013
7% Senior Notes due September 2050 [Member]
Debt Instrument [Line Items]                                  
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                                
Scheduled principal payments on debt in 2018 0                                
Revolving credit line       500 500       100 100              
Interest rate on revolving debt facility       1.375%     1.00% 1.875% 1.11%   0.875%            
Amount borrowed under AFG revolving credit facility       0 0 0                      
Loans payable under National Interstate bank credit facility                 12 12              
Proceeds from Issuance of Senior Long-term Debt                           230   125  
Cash interest payments on long-term debt 71 75 74                            
Interest rate description for revolving credit facility         1.00% to 1.875% (currently 1.375%) over LIBOR         LIBOR plus 0.875% (currently 1.11%)              
Interest rate on debt instruments                       9.875% 6.375%   5.75%   7.00%
Secured borrowings guaranteed by AFG   $ 16