Intangible Assets (Tables)

6 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Components of Intangible Assets

Intangible assets consisted of:

	March 31, 2019				September 30, 2018
(Millions of dollars)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Amortized intangible assets
Developed technology	$	13,976	$	2,352	$	13,966	$	1,782
Customer relationships	4,586		1,022		4,584		861
Product rights	118		60		121		58
Trademarks	407		93		407		84
Patents and other	407		295		397		288
Amortized intangible assets	$	19,495	$	3,822	$	19,475	$	3,073
Unamortized intangible assets
Acquired in-process research and development	$	31			$	37
Trademarks	2				2
Unamortized intangible assets	$	33			$	39

Reconciliation of Goodwill by Business Segment

The following is a reconciliation of goodwill by business segment:

(Millions of dollars)	Medical			Life Sciences			Interventional			Total
Goodwill as of September 30, 2018	$	10,054		$	775		$	12,771		$	23,600
Divestiture-related adjustments	—			3			—			3
Purchase accounting adjustments (a)	(15		)	—			(70		)	(84		)
Currency translation	(3		)	(2		)	—			(5		)
Goodwill as of March 31, 2019	$	10,036		$	776		$	12,701		$	23,513

(a) The purchase accounting adjustments were primarily driven by adjustments to tax-related balances.