Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Gains (losses) on change in fair value of assets/liabilities:
Assets	$ (57)	$ 12
Liabilities	54	(2)
Management fees paid to AFG	3	3
Variable interest entity, primary beneficiary
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings attributable to AFG	$ 2	$ 14