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Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Gains (losses) on change in fair value of assets/liabilities:    
Assets $ (57) $ 46
Liabilities 52 (44)
Management fees paid to AFG 4 4
CLO earnings (losses) attributable to AFG shareholders (2) 18
Variable interest entity, primary beneficiary | Continuing operations    
Gains (losses) on change in fair value of assets/liabilities:    
CLO earnings (losses) attributable to AFG shareholders (2) 5
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 $ 13