Restructuring Activities: (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Oct. 29, 2024 subsidiary
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 6	$ 243	$ 30	$ 243
Number of subsidiaries with proposals for factory closure \| subsidiary					2
Further Integration Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges			30
Restructuring charges, expected	$ 50		50
Manufacturing Footprint Optimization, Germany
Restructuring Cost and Reserve [Line Items]
Restructuring charges		243
Employee Severance \| Further Integration Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges			25
Asset Impairment \| Further Integration Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 5
Asset Impairment \| Manufacturing Footprint Optimization, Germany
Restructuring Cost and Reserve [Line Items]
Restructuring charges		92
Pension And Employee Separation Costs \| Manufacturing Footprint Optimization, Germany
Restructuring Cost and Reserve [Line Items]
Restructuring charges		127
Contract Termination and Other Charges \| Manufacturing Footprint Optimization, Germany
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 24