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Supplemental Cash Flow Statement and Other Disclosures (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Cash, Cash Equivalents and Restricted Cash        
Cash and cash equivalents $ 568 $ 1,440 $ 885 $ 695
Current restricted cash (included in other current assets) $ 4 $ 4 $ 8 $ 15
Location of current restricted cash Other current assets Other current assets Other current assets Other current assets
Noncurrent restricted cash (included in other assets) $ 7   $ 6  
Cash reported in current assets held for sale     32  
Total cash, cash equivalents and restricted cash 579 $ 1,444 931 [1] $ 710 [1]
Other Non-cash items        
PP&E acquired but not yet paid 115 $ 101 96 $ 204
Amount of obligations outstanding $ 276   $ 423  
Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration] Accounts Payable, Current   Accounts Payable, Current  
[1] Includes $32 million of cash presented in current assets held for sale on the unaudited condensed consolidated balance sheet as of December 31, 2024.