Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Gains (losses) on change in fair value of assets/liabilities:
Assets	$ 7	$ 10	$ (297)	$ 77
Liabilities	(12)	(9)	272	(68)
Management fees paid to AFG	4	4	12	12
CLO earnings (losses) attributable to AFG shareholders	4	5	(10)	37
Variable interest entity, primary beneficiary | Continuing operations
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings (losses) attributable to AFG shareholders	4	5	(10)	17
Variable interest entity, primary beneficiary | Net earnings from discontinued operations | Annuity subsidiaries
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings (losses) attributable to AFG shareholders	$ 0	$ 0	$ 0	$ 20