Segments of Operations (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 segment		Mar. 31, 2013
Segments of Operations (Textual) [Abstract]
Number of segments	4
Earnings (losses) of managed investment entities attributable to noncontrolling interests (are less than in 2014)	$ 0	[1]	$ (11)	[1]
Other [Member]
Segments of Operations (Textual) [Abstract]
Earnings (losses) of managed investment entities attributable to noncontrolling interests (are less than in 2014)			(11)
Maximum [Member] | Other [Member]
Segments of Operations (Textual) [Abstract]
Earnings (losses) of managed investment entities attributable to noncontrolling interests (are less than in 2014)	$ 1

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