Business Restructuring Charges (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2023 USD ($)
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 80
Charged to expense	69
Cash payments	(65)
Ending Balance	81
Other Initiatives
Restructuring Reserve [Roll Forward]
Non-cash settlements	(5)
Other adjustments	2
Employee Termination
Restructuring Reserve [Roll Forward]
Beginning Balance	79
Charged to expense	35
Cash payments	(36)
Ending Balance	80
Employee Termination | Other Initiatives
Restructuring Reserve [Roll Forward]
Non-cash settlements	0
Other adjustments	2
Other
Restructuring Reserve [Roll Forward]
Beginning Balance	1
Charged to expense	34
Cash payments	(29)
Ending Balance	1
Other | Other Initiatives
Restructuring Reserve [Roll Forward]
Non-cash settlements	(5)
Other adjustments	$ 0