Acquisitions and Dispositions - Acquisition of property, plant and equipment (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
PP&E acquired but not yet paid	$ 104	$ 139	$ 96	$ 204
Discontinued Operations, Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
PP&E acquired but not yet paid		$ 17