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Arbitrage Trading Account (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivative [Line Items] |  |
Arbitrage trading account | $ 1,070 | $ 1,123
Long | Options held |  |
Derivative [Line Items] |  |
Fair value of derivative | 6 |
Notional amount of derivative | 156 |
Short | Options held |  |
Derivative [Line Items] |  |
Fair value of derivative | 34 |
Notional amount of derivative | $ 163 |

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