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Arbitrage Trading Account (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
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Derivative [Line Items] |  |
Arbitrage trading account | $ 1,189,000,000 | $ 1,180,000,000
Short | Options held |  |
Derivative [Line Items] |  |
Fair value of derivative | 242,000 |
Notional amount of derivative | $ 29,200,000 |

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