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Intangible Assets
 3 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consisted of:
 December 31, 2024September 30, 2024
(Millions of dollars)Gross
Carrying
Amount		Accumulated
Amortization		Net Carrying AmountGross
Carrying
Amount		Accumulated
Amortization		Net Carrying Amount
Amortized intangible assets
Developed technology$15,788 $(8,349)$7,439 $15,827 $(8,094)$7,733 
Customer relationships5,511 (2,978)2,533 5,513 (2,878)2,635 
Patents, trademarks and other1,188 (688)500 1,185 (682)503 
Amortized intangible assets$22,486 $(12,014)$10,472 $22,525 $(11,654)$10,871 
Unamortized intangible assets
Acquired in-process research and development$14 $44 
Trademarks2 2 
Unamortized intangible assets$16 $46 
Intangible amortization expense was $395 million and $365 million for the three months ended December 31, 2024 and 2023, respectively.
The following is a reconciliation of goodwill by business segment:
(Millions of dollars)Medical Life SciencesInterventional Total
Goodwill as of September 30, 2024$12,832 $904 $12,729 $26,465 
Purchase price allocation adjustments(12)— — (12)
Currency translation(51)(8)(66)(125)
Goodwill as of December 31, 2024$12,769 $896 $12,663 $26,329