Business Restructuring Charges (Detail) $ in Millions	6 Months Ended
	Mar. 31, 2023 USD ($)
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 35
Charged to expense	59
Cash payments	(60)
Ending Balance	23
Other Initiatives
Restructuring Reserve [Roll Forward]
Non-cash settlements	(11)
Employee Termination
Restructuring Reserve [Roll Forward]
Beginning Balance	24
Charged to expense	10
Cash payments	(14)
Ending Balance	20
Employee Termination | Other Initiatives
Restructuring Reserve [Roll Forward]
Non-cash settlements	0
Other (a)
Restructuring Reserve [Roll Forward]
Beginning Balance	11
Charged to expense	49
Cash payments	(46)
Ending Balance	3
Other (a) | Other Initiatives
Restructuring Reserve [Roll Forward]
Non-cash settlements	$ (11)