Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Gains (losses) on change in fair value of assets/liabilities:
Assets	$ (2)	$ 144	$ (267)
Liabilities	6	(117)	236
Management fees paid to AFG	13	16	17
Variable interest entity, primary beneficiary
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings (losses) attributable to AFG	$ 33	$ 27	$ (10)