Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Gains (losses) on change in fair value of assets/liabilities:
Assets	$ 69	$ (69)	$ 80
Liabilities	(59)	49	(94)
Management fees paid to AFG	16	15	15
CLO earnings (losses) attributable to AFG Shareholders	40	(2)	4
Variable interest entity, primary beneficiary | Continuing operations
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings (losses) attributable to AFG Shareholders	20	(1)	1
Variable interest entity, primary beneficiary | Net earnings (loss) from discontinued operations | Annuity subsidiaries
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings (losses) attributable to AFG Shareholders	$ 20	$ (1)	$ 3