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Intangible Assets
 9 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consisted of:
 June 30, 2020September 30, 2019
(Millions of dollars)Gross
Carrying
Amount		Accumulated
Amortization		Gross
Carrying
Amount		Accumulated
Amortization
Amortized intangible assets
Developed technology$14,059  $3,702  $13,960  $2,906  
Customer relationships4,612  1,427  4,608  1,183  
Product rights115  68  110  60  
Trademarks408  115  407  102  
Patents and other503  322  445  305  
Amortized intangible assets$19,697  $5,634  $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.
Intangible amortization expense for the three months ended June 30, 2020 and 2019 was $345 million and $378 million, respectively. Intangible amortization expense for the nine months ended June 30, 2020 and 2019 was $1.037 billion and $1.132 billion, respectively.
The following is a reconciliation of goodwill by business segment:
(Millions of dollars)Medical Life SciencesInterventional 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  —  1  
Currency translation19  3  33  55  
Goodwill as of June 30, 2020$10,019  $834  $12,697  $23,549  
(a)Represents goodwill recognized relative to certain acquisitions which were not material individually or in the aggregate.