Business Restructuring Charges (Detail) $ in Millions	9 Months Ended
	Jun. 30, 2023 USD ($)
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 35
Charged to expense	120
Cash payments	(97)
Ending Balance	45
Other Initiatives
Restructuring Reserve [Roll Forward]
Non-cash settlements	(14)
Other adjustments	1
Employee Termination
Restructuring Reserve [Roll Forward]
Beginning Balance	24
Charged to expense	46
Cash payments	(25)
Ending Balance	45
Employee Termination | Other Initiatives
Restructuring Reserve [Roll Forward]
Non-cash settlements	0
Other adjustments	0
Other (a)
Restructuring Reserve [Roll Forward]
Beginning Balance	11
Charged to expense	74
Cash payments	(72)
Ending Balance	0
Other (a) | Other Initiatives
Restructuring Reserve [Roll Forward]
Non-cash settlements	(14)
Other adjustments	$ 1