Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Gains (losses) on change in fair value of assets/liabilities:
Assets	$ (267)	$ 69	$ (69)
Liabilities	236	(59)	49
Management fees paid to AFG	17	16	15
CLO earnings (losses) attributable to AFG Shareholders	(10)	40	(2)
Variable interest entity, primary beneficiary | Continuing operations
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings (losses) attributable to AFG Shareholders	(10)	20	(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	$ 0	$ 20	$ (1)