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Financial Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financial instruments |  |
Total debt | $ 6,221 | $ 6,881
Carrying amount |  |
Financial instruments |  |
Cash and cash equivalents | 833 | 560
Restricted cash and cash equivalents | 417 | 381
Total debt | 6,221 | 6,881
Fair value |  |
Financial instruments |  |
Cash and cash equivalents | 833 | 560
Restricted cash and cash equivalents | 417 | 381
Total debt | $ 6,241 | $ 6,888

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