Restructuring Activities: (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 24	$ 0
Further Integration Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	24
Restructuring charges, expected	55
Employee Severance | Further Integration Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	19
Asset Impairment | Further Integration Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5