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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair value measurements |  |
Cash, cash equivalents, and reserved funds, carrying value | $ 695 | $ 987
Long-term debt | 1,900 | 1,900
Level 1 |  |
Fair value measurements |  |
Cash, cash equivalents, and reserved funds, fair value | 695 | 987
Level 2 |  |
Fair value measurements |  |
Long-term debt, fair value | $ 1,500 | $ 1,500

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