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Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Gains (losses) on change in fair value of assets/liabilities: |  |  |  |  |
Assets | $ 21 | $ 363 | $ 67 | $ (316) |
Liabilities | (15) | (366) | (59) | 300 |
Management fees paid to AFG | 4 | 4 | 8 | 8 |
CLO earnings (losses) attributable to AFG shareholders | 14 | 2 | 32 | (34) |
Variable interest entity, primary beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment in CLO tranches | 57 | 157 | 57 | 157 | $ 200
Variable interest entity, primary beneficiary | Continuing operations |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment in CLO tranches | 57 | 39 | 57 | 39 |
Gains (losses) on change in fair value of assets/liabilities: |  |  |  |  |
CLO earnings (losses) attributable to AFG shareholders | 7 | 0 | 12 | (11) |
Variable interest entity, primary beneficiary | Net earnings (loss) from discontinued operations | Annuity subsidiaries |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Investment in CLO tranches | 0 | 118 | 0 | 118 |
Gains (losses) on change in fair value of assets/liabilities: |  |  |  |  |
CLO earnings (losses) attributable to AFG shareholders | $ 7 | $ 2 | $ 20 | $ (23) |

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