Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Gains (losses) on change in fair value of assets/liabilities:
Assets	[1]	$ 131	$ (116)	$ (66)
Liabilities	[1]	(116)	82	22
Management fees paid to AFG		17	15	25
CLO earnings (losses) attributable to:
AFG shareholders	[2]	37	(6)	16
Noncontrolling interests	[2]	0	0	(51)
Variable interest entity, primary beneficiary
Variable Interest Entity [Line Items]
Investment in CLO tranches		$ 216	$ 266	$ 289

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

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