Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Gains (losses) on change in fair value of assets/liabilities:
Assets	[1]	$ 60	$ (53)	$ 107	$ (27)
Liabilities	[1]	(49)	42	(98)	11
Management fees paid to AFG		4	4	12	11
CLO earnings (losses) attributable to AFG shareholders	[2]	$ 17	$ (3)	$ 29	$ 5

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

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