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Fair Value of Financial Instruments - Schedule of Changes in Warrants (Details) - Level 3 - Root Warrants - Root Warrants - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Opening balance | $ 243 | $ 58 | $ 120 | $ 5
Unrealized (loss) gain | (120) | (26) | 3 | 27
Ending balance | $ 123 | $ 32 | $ 123 | $ 32

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