Intangible Assets

12 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

Intangible assets at September 30 consisted of:

	2021						2020
(Millions of dollars)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortized intangible assets
Developed technology	$	14,399	$	(4,983)	$	9,417	$	14,105	$	(3,959)	$	10,146
Customer relationships	4,658		(1,839)		2,818		4,616		(1,509)		3,107
Product rights	123		(83)		40		119		(73)		46
Trademarks	409		(137)		271		408		(120)		288
Patents and other	533		(342)		191		500		(320)		180
Amortized intangible assets	$	20,122	$	(7,385)	$	12,737	$	19,748	$	(5,981)	$	13,767
Unamortized intangible assets
Acquired in-process research and development	$	44					$	44
Trademarks	2						2
Unamortized intangible assets	$	46					$	46

Intangible amortization expense was $1.403 billion, $1.384 billion and $1.497 billion in 2021, 2020 and 2019, respectively. The estimated aggregate amortization expense for the fiscal years ending September 30, 2022 to 2026 are as follows: 2022 — $1.399 billion; 2023 — $1.386 billion; 2024 — $1.384 billion; 2025 — $1.383 billion; 2026 — $1.357 billion.

The following is a reconciliation of goodwill by business segment:

(Millions of dollars)	Medical		Life Sciences		Interventional		Total
Goodwill as of September 30, 2019	$	9,989	$	772	$	12,615	$	23,376
Acquisitions (a)	10		58		49		117
Purchase price allocation adjustments	—		1		4		5
Currency translation	44		7		71		122
Goodwill as of September 30, 2020	$	10,044	$	837	$	12,739	$	23,620
Acquisitions (a)	193		—		72		264
Purchase price allocation adjustments	4		—		1		6
Currency translation	15		(1)		(2)		12
Goodwill as of September 30, 2021	$	10,255	$	836	$	12,810	$	23,901

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