Investment Information - Restricted assets (Details) - USD ($) $ in Thousands |
Dec. 31, 2022 |
Dec. 31, 2021 |
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|---|---|---|---|---|
| Restricted Assets [Line Items] | ||||
| Restricted assets | $ 8,701,480 | $ 8,249,732 | ||
| Collateral or guarantees - affiliated transactions | ||||
| Restricted Assets [Line Items] | ||||
| Restricted assets | 4,254,398 | 4,223,955 | ||
| Collateral or guarantees - third party agreements | ||||
| Restricted Assets [Line Items] | ||||
| Restricted assets | 2,632,892 | 2,289,631 | ||
| Deposits with US regulatory authorities | ||||
| Restricted Assets [Line Items] | ||||
| Restricted assets | 776,342 | 798,100 | ||
| Deposits with non-US regulatory authorities | ||||
| Restricted Assets [Line Items] | ||||
| Restricted assets | [1] | $ 1,037,848 | $ 938,046 | |
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