Business Restructuring Charges (Detail) $ in Millions	6 Months Ended
	Mar. 31, 2024 USD ($)
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 80
Charged to expense	167
Cash payments	(144)
Ending Balance	70
Other Initiatives
Restructuring Reserve [Roll Forward]
Non-cash settlements	(34)
Other adjustments	1
Employee Termination
Restructuring Reserve [Roll Forward]
Beginning Balance	79
Charged to expense	60
Cash payments	(71)
Ending Balance	69
Employee Termination | Other Initiatives
Restructuring Reserve [Roll Forward]
Non-cash settlements	0
Other adjustments	1
Other
Restructuring Reserve [Roll Forward]
Beginning Balance	1
Charged to expense	107
Cash payments	(73)
Ending Balance	1
Other | Other Initiatives
Restructuring Reserve [Roll Forward]
Non-cash settlements	(34)
Other adjustments	$ 0