Intangible Assets

6 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

Intangible assets consisted of:

	March 31, 2021				September 30, 2020
(Millions of dollars)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Amortized intangible assets
Developed technology	$	14,184	$	4,474	$	14,105	$	3,959
Customer relationships	4,651		1,674		4,616		1,509
Product rights	125		81		119		73
Trademarks	408		129		408		120
Patents and other	526		334		500		320
Amortized intangible assets	$	19,894	$	6,692	$	19,748	$	5,981
Unamortized intangible assets
Acquired in-process research and development	$	44			$	44
Trademarks	2				2
Unamortized intangible assets	$	46			$	46

Intangible amortization expense for the three months ended March 31, 2021 and 2020 was $350 million and $347 million, respectively. Intangible amortization expense for the six months ended March 31, 2021 and 2020 was $698 million and $693 million, respectively.

The following is a reconciliation of goodwill by business segment:

(Millions of dollars)	Medical		Life Sciences		Interventional		Total
Goodwill as of September 30, 2020	$	10,044	$	837	$	12,739	$	23,620
Acquisitions (a)	99		—		—		99
Purchase price allocation adjustments	2		—		1		3
Currency translation	28		2		20		49
Goodwill as of March 31, 2021	$	10,173	$	839	$	12,760	$	23,772

(a)Represents goodwill recognized relative to certain acquisitions which were not material individually or in the aggregate.