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Intangible Assets
 6 Months Ended
Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consisted of:
 March 31, 2025September 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$15,805 $(8,634)$7,171 $15,827 $(8,094)$7,733 
Customer relationships5,515 (3,082)2,434 5,513 (2,878)2,635 
Patents, trademarks and other1,224 (711)513 1,185 (682)503 
Amortized intangible assets$22,544 $(12,426)$10,118 $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 $396 million and $366 million for the three months ended March 31, 2025 and 2024, respectively, and $791 million and $731 million for the six months ended March 31, 2025 and 2024, 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 adjustments56 — — 56 
Currency translation(30)(5)(42)(77)
Goodwill as of March 31, 2025$12,858 $899 $12,687 $26,444