Segments of Operations (Details Textual) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2015 USD ($)		Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment		Jun. 30, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of segments | segment					4
Other income		$ 90		$ 26	$ 137		$ 47
Earnings (losses) of managed investment entities attributable to noncontrolling interests	[1]	0		(18)	0		(18)
Property and Casualty Insurance [Member]
Segment Reporting Information [Line Items]
Other income		53	[2]	2	$ 59	[2]	4
Property and Casualty Insurance [Member] | Real Estate Investment [Member]
Segment Reporting Information [Line Items]
Other income	[2]	$ 51
Other [Member]
Segment Reporting Information [Line Items]
Earnings (losses) of managed investment entities attributable to noncontrolling interests				$ (18)			$ (18)

[1] Included in Earnings before income taxes in AFG’s Statement of Earnings.

[2] Includes pretax income of $51 million (before noncontrolling interest) from the sale of the Le Pavillon Hotel in the second quarter of 2015.