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Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Intangible Assets
Intangible assets at September 30 consisted of:
 20202019
(Millions of dollars)Gross
Carrying
Amount		Accumulated
Amortization		Gross
Carrying
Amount		Accumulated
Amortization
Amortized intangible assets
Developed technology$14,105 $3,959 $13,960 $2,906 
Customer relationships4,616 1,509 4,608 1,183 
Product rights119 73 110 60 
Trademarks408 120 407 102 
Patents and other500 320 445 305 
Amortized intangible assets$19,748 $5,981 $19,530 $4,555 
Unamortized intangible assets
Acquired in-process research and development (a)$44 $1 
Trademarks2 2 
Unamortized intangible assets$46 $3 
(a)The increase in the carrying value of assets in 2020 was attributable to an immaterial acquisition which occurred during the second quarter of fiscal year 2020.
Reconciliation of Goodwill by Business Segment
The following is a reconciliation of goodwill by business segment:
(Millions of dollars)MedicalLife SciencesInterventionalTotal
Goodwill as of September 30, 2018$10,054 $775 $12,771 $23,600 
Divestitures and related adjustments (a)— 3 — 3 
Purchase price allocation adjustments (b)(15)— (75)(90)
Currency translation(50)(6)(81)(137)
Goodwill as of September 30, 2019$9,989 $772 $12,615 $23,376 
Acquisitions (c)10 58 49 117 
Purchase price allocation adjustments— 1 4 5 
Currency translation44 7 71 122 
Goodwill as of September 30, 2020$10,044 $837 $12,739 $23,620 
(a)Represents adjustments to goodwill derecognized upon the Company's sale of certain businesses, as further discussed in Note 11.
(b)The purchase price allocation adjustments were primarily driven by adjustments to tax-related balances recorded upon the finalization of the Bard acquisition allocation within one year of the transaction's closing.
(c)Represents goodwill recognized relative to certain acquisitions which were not material individually or in the aggregate.