Intangible Assets - Reconciliation of Goodwill by Business Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 23,600	$ 7,563
Goodwill, Acquired During Period		15,217
Goodwill, Written off Related to Sale of Business Unit	3	116
Goodwill, Transfers		0
Goodwill, Purchase Accounting Adjustments	(90)	959
Goodwill, Foreign Currency Translation Gain (Loss)	(137)	(24)
Goodwill, ending balance	23,376	23,600
Medical
Goodwill [Roll Forward]
Goodwill, beginning balance	10,054	6,802
Goodwill, Acquired During Period		3,923
Goodwill, Written off Related to Sale of Business Unit	0	0
Goodwill, Transfers		(877)
Goodwill, Purchase Accounting Adjustments	(15)	228
Goodwill, Foreign Currency Translation Gain (Loss)	(50)	(22)
Goodwill, ending balance	9,989	10,054
Life Sciences
Goodwill [Roll Forward]
Goodwill, beginning balance	775	761
Goodwill, Acquired During Period		76
Goodwill, Written off Related to Sale of Business Unit	3	59
Goodwill, Transfers		0
Goodwill, Purchase Accounting Adjustments	0	(2)
Goodwill, Foreign Currency Translation Gain (Loss)	(6)	(2)
Goodwill, ending balance	772	775
Interventional
Goodwill [Roll Forward]
Goodwill, beginning balance	12,771	0
Goodwill, Acquired During Period		11,218
Goodwill, Written off Related to Sale of Business Unit	0	57
Goodwill, Transfers		877
Goodwill, Purchase Accounting Adjustments	(75)	732
Goodwill, Foreign Currency Translation Gain (Loss)	(81)	0
Goodwill, ending balance	$ 12,615	$ 12,771