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Intangible Assets
 3 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consisted of:
 December 31, 2023September 30, 2023
(Millions of dollars)Gross
Carrying
Amount		Accumulated
Amortization		Net Carrying AmountGross
Carrying
Amount		Accumulated
Amortization		Net Carrying Amount
Amortized intangible assets
Developed technology$15,106 $(7,299)$7,807 $15,080 $(7,023)$8,058 
Customer relationships4,862 (2,610)2,252 4,859 (2,521)2,338 
Patents, trademarks and other1,151 (642)509 1,130 (624)505 
Amortized intangible assets$21,119 $(10,551)$10,568 $21,069 $(10,168)$10,901 
Unamortized intangible assets
Acquired in-process research and development$44 $44 
Trademarks2 2 
Unamortized intangible assets$46 $46 
Intangible amortization expense was $365 million for each of the three months ended December 31, 2023 and 2022.
The following is a reconciliation of goodwill by business segment:
(Millions of dollars)Medical Life SciencesInterventional Total
Goodwill as of September 30, 2023$10,955 $897 $12,670 $24,522 
Currency translation33 4 38 75 
Goodwill as of December 31, 2023$10,988 $901 $12,708 $24,597