Managed Investment Entities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Gains (losses) on change in fair value of assets/liabilities:
Assets	$ (30)	[1]	$ (2)	[1]	$ (32)	[1]	$ 1	[1]
Liabilities	5	[1]	17	[1]	(3)	[1]	(22)	[1]
Management fees paid to AFG	7		4		18		12
CLO earnings (losses) attributable to:
AFG shareholders	7	[2]	9	[2]	18	[2]	27	[2]
Noncontrolling interests	$ (29)	[2]	$ 12	[2]	$ (47)	[2]	$ (30)	[2]

[1] Included in Revenues in AFG’s Statement of Earnings.

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