Restructuring Program - Restructuring Activity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Dec. 31, 2025
Restructuring Reserve [Roll Forward]
Beginning balance		$ 189	$ 189
Cost incurred	$ 369	215	584
Cost paid/settled			(380)
Ending balance	393		393
Separations
Restructuring Reserve [Roll Forward]
Beginning balance		120	120
Cost incurred	198	124	322
Cost paid/settled			(172)
Ending balance	271		271
Asset Related Costs
Restructuring Reserve [Roll Forward]
Beginning balance		0	0
Cost incurred	83	27	109
Cost paid/settled			(109)
Ending balance	0		0
Other
Restructuring Reserve [Roll Forward]
Beginning balance		69	69
Cost incurred	88	$ 65	152
Cost paid/settled			(99)
Ending balance	$ 122		$ 122