Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Gains (losses) on change in fair value of assets/liabilities:
Assets	$ 12	$ 34
Liabilities	(2)	(38)
Management fees paid to AFG	3	4
Variable interest entity, primary beneficiary
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings attributable to AFG	$ 14	$ 1