Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Gains (losses) on change in fair value of assets/liabilities:
Assets	$ 32	$ (247)	$ 66	$ (304)
Liabilities	(32)	232	(70)	284
Management fees paid to AFG	4	4	8	8
Variable interest entity, primary beneficiary
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings (losses) attributable to AFG	$ 5	$ (12)	$ 6	$ (14)