Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Gains (losses) on change in fair value of assets/liabilities:
Assets	$ 50	$ 7	$ 116	$ (297)
Liabilities	(34)	(12)	(104)	272
Management fees paid to AFG	4	4	12	12
Variable interest entity, primary beneficiary
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings (losses) attributable to AFG	$ 12	$ 4	$ 18	$ (10)