Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Gains (losses) on change in fair value of assets/liabilities:
Assets	$ (7)	$ 50	$ (10)	$ 116
Liabilities	(2)	(34)	15	(104)
Management fees paid to AFG	3	4	9	12
Variable interest entity, primary beneficiary
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings attributable to AFG	$ 2	$ 12	$ 25	$ 18