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Contingencies - Narrative (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 24, 2023 | Nov. 21, 2022 | Dec. 31, 2020
Loss Contingencies [Line Items] |  |  |
Additional total refund requested to be provided to private automobile policyholders |  | $ 52 |
Reductions in premiums written, net |  |  | $ 128
Subsequent Event |  |  |
Loss Contingencies [Line Items] |  |  |
Aggregate credit amount | $ 25 |  |

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