Intangible Assets (Tables)

6 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Components of Intangible Assets

Intangible assets consisted of:

	March 31, 2018				September 30, 2017
(Millions of dollars)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Amortized intangible assets
Developed technology	$	13,948	$	1,386	$	3,508	$	1,029
Customer relationships	4,566		702		3,393		564
Product rights	131		58		131		54
Trademarks	408		71		408		65
Patents and other	382		274		370		274
Amortized intangible assets	$	19,435	$	2,490	$	7,811	$	1,986
Unamortized intangible assets
Acquired in-process research and development	$	54			$	67
Trademarks	2				2
Unamortized intangible assets	$	56			$	69

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, 2017	$	6,802		$	761	$	—		$	7,563
Acquisitions (a)	4,389			76		10,674			15,139
Divestitures	—			—		(57		)	(57		)
Reallocation of goodwill for change in segment and reporting unit composition (b)	(877		)	—		877			—
Purchase accounting adjustments (c)	140			—		685			825
Currency translation	14			5		—			19
Goodwill as of March 31, 2018	$	10,469		$	843	$	12,179		$	23,491

(a) Represents goodwill recognized upon the Company's acquisition of Bard, which is further discussed in Note 8. Also includes goodwill recognized relative to certain acquisitions which were not material individually or in the aggregate.

(b) Represents the reassignment of goodwill, determined based upon a relative fair value allocation approach, associated with the movement of certain product offerings which were previously reported in the Medical segment and which are now reported in the Interventional segment as further discussed in Note 6.

(c) The purchase accounting adjustments increasing goodwill were primarily driven by the valuation of developed technology assets acquired in the Bard transaction and the associated deferred tax liability changes. The change also reflects an increase to goodwill resulting from alignment of the combined organization's accounting policies with respect to accrued liabilities and other accounts.