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Insurance - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Insurance [Line Items] |  |  |
Carrying value of cash and securities owned by U.S.-based insurance subsidiaries on deposit | $ 1,230 |  |
Workers' compensation insurance discount rate | 3.50% | 3.50% |
Workers' compensation insurance discount, which has reduced the liability for unpaid losses and loss adjustment expenses | $ 8 | $ 9 |
Pretax COVID-19 related losses | 16 | 115 |
Amortization of deferred policy acquisition costs | 580 | 615 | $ 721
Dividends on common stock | 2,380 | 336 | 446
Dividends payments without violating the most restrictive debt covenants, minimum | 1,000 |  |
Maximum |  |  |
Insurance [Line Items] |  |  |
Maximum amount of dividends available to be paid by insurance subsidiaries to AFG without prior approval of regulatory authorities | $ 843 |  |
Maximum | Allowance for reinsurance recoverables |  |  |
Insurance [Line Items] |  |  |
Net expense reduction against the allowance for losses on reinsurance recoverables |  |  | 1
Catastrophe Bonds |  |  |
Insurance [Line Items] |  |  |
Catastrophe reinsurance coverage, excess retention percentage | 94.00% |  |
Catastrophe reinsurance coverage, excess retention amount | $ 325 |  |
Catastrophe reinsurance coverage, retention amount | 125 |  |
Catastrophe reinsurance coverage, annual cost | 16 |  |
Neon exited lines charge |  |  |
Insurance [Line Items] |  |  |
Prior year claims and claims adjustment expense | 0 | 19 | 7
Other |  |  |
Insurance [Line Items] |  |  |
Prior year claims and claims adjustment expense | (279) | (193) | (168)
Other | COVID-19 |  |  |
Insurance [Line Items] |  |  |
Prior year claims and claims adjustment expense | $ 19 |  |
Property and casualty insurance | Other lines |  |  |
Insurance [Line Items] |  |  |
Special A&E charges |  | 47 | $ 18
Neon Capital Limited | Property and casualty insurance | Other lines |  |  |
Insurance [Line Items] |  |  |
Pretax COVID-19 related losses |  | $ 20 |

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