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Arbitrage Trading Account (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative [Line Items] |  |
Arbitrage trading account | $ 1,146,000,000 | $ 938,000,000
Long | Options held |  |
Derivative [Line Items] |  |
Fair value of derivative | 117,000 |
Notional amount of derivative | 162,000,000 |
Short | Options held |  |
Derivative [Line Items] |  |
Fair value of derivative | 40,000,000 |
Notional amount of derivative | $ 162,000,000 |

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