Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Gains (losses) on change in fair value of assets/liabilities:
Assets	$ 34	$ (57)
Liabilities	(38)	52
Management fees paid to AFG	4	4
Variable interest entity, primary beneficiary
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings (losses) attributable to AFG	$ 1	$ (2)