Intangible Assets - Reconciliation of Goodwill by Business Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 23,376	$ 23,600
Goodwill, Acquired During Period	117
Goodwill, Written off Related to Sale of Business Unit		3
Goodwill, Purchase Accounting Adjustments	5	(90)
Goodwill, Foreign Currency Translation Gain (Loss)	122	(137)
Goodwill, ending balance	23,620	23,376
Medical
Goodwill [Roll Forward]
Goodwill, beginning balance	9,989	10,054
Goodwill, Acquired During Period	10
Goodwill, Written off Related to Sale of Business Unit		0
Goodwill, Purchase Accounting Adjustments	0	(15)
Goodwill, Foreign Currency Translation Gain (Loss)	44	(50)
Goodwill, ending balance	10,044	9,989
Life Sciences
Goodwill [Roll Forward]
Goodwill, beginning balance	772	775
Goodwill, Acquired During Period	58
Goodwill, Written off Related to Sale of Business Unit		3
Goodwill, Purchase Accounting Adjustments	1	0
Goodwill, Foreign Currency Translation Gain (Loss)	7	(6)
Goodwill, ending balance	837	772
Interventional
Goodwill [Roll Forward]
Goodwill, beginning balance	12,615	12,771
Goodwill, Acquired During Period	49
Goodwill, Written off Related to Sale of Business Unit		0
Goodwill, Purchase Accounting Adjustments	4	(75)
Goodwill, Foreign Currency Translation Gain (Loss)	71	(81)
Goodwill, ending balance	$ 12,739	$ 12,615