Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Statutory rate of income taxes	35.00%	35.00%	35.00%	35.00%
Change in AFG's liability for uncertain tax positions of prior year	$ 20
Unrecognized tax benefits that would favorably impact effective tax rate	$ 4		$ 4