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Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Gains (losses) on change in fair value of assets/liabilities: |  |  |  |  |
Assets | $ 10 | $ 132 | $ 77 | $ (184) |
Liabilities | (9) | (137) | (68) | 163 |
Management fees paid to AFG | 4 | 3 | 12 | 11 |
CLO earnings (losses) attributable to AFG shareholders | 5 | 13 | 37 | (21) |
Variable interest entity, primary beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment in CLO tranches | 96 | 176 | 96 | 176 | $ 200
Variable interest entity, primary beneficiary | Continuing operations |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment in CLO tranches | 96 | 47 | 96 | 47 |
Gains (losses) on change in fair value of assets/liabilities: |  |  |  |  |
CLO earnings (losses) attributable to AFG shareholders | 5 | 4 | 17 | (7) |
Variable interest entity, primary beneficiary | Net earnings (loss) from discontinued operations | Annuity subsidiaries |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment in CLO tranches | 0 | 129 | 0 | 129 | $ 143
Gains (losses) on change in fair value of assets/liabilities: |  |  |  |  |
CLO earnings (losses) attributable to AFG shareholders | $ 0 | $ 9 | $ 20 | $ (14) |

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