Restructuring Program - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) employee
Restructuring Cost and Reserve [Line Items]
Expected costs, term (in years)			2 years
Expected number of personnel, reduction | employee			7,000
Restructuring charges	$ 369	$ 215	$ 584
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	180		280
Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	171		277
Other Non-operating Income/(Expense)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	18		27
Minimum
Restructuring Cost and Reserve [Line Items]
Historical restructuring costs, before tax	250		250
Expected costs	1,500		1,500
Maximum
Restructuring Cost and Reserve [Line Items]
Historical restructuring costs, before tax	500		500
Expected costs	$ 2,000		$ 2,000