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Acquisitions and Dispositions - Acquisition of property, plant and equipment (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Acquisitions and Dispositions        
PP&E acquired but not yet paid $ 115 $ 101 $ 96 $ 204
Discontinued Operations, Disposed of by Sale        
Acquisitions and Dispositions        
PP&E acquired but not yet paid   $ 17