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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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