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Intangible Assets
 12 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets at September 30 consisted of:
 20232022
(Millions of dollars)Gross
Carrying
Amount		Accumulated
Amortization		Net Carrying AmountGross
Carrying
Amount		Accumulated
Amortization		Net Carrying Amount
Amortized intangible assets
Developed technology$15,080 $(7,023)$8,058 $15,087 $(5,979)$9,108 
Customer relationships4,859 (2,521)2,338 4,853 (2,170)2,683 
Patents, trademarks and other1,130 (624)505 1,046 (574)473 
Amortized intangible assets$21,069 $(10,168)$10,901 $20,987 $(8,723)$12,264 
Unamortized intangible assets
Acquired in-process research and development$44 $44 
Trademarks2 2 
Unamortized intangible assets$46 $46 
Intangible amortization expense was $1.465 billion, $1.430 billion and $1.402 billion in 2023, 2022 and 2021, respectively. The estimated aggregate amortization expense for the fiscal years ending September 30, 2024 to 2028 are as follows: 2024 — $1.434 billion; 2025 — $1.431 billion; 2026 — $1.398 billion; 2027 — $1.327 billion; 2028 — $1.239 billion.
The following is a reconciliation of goodwill by business segment:
(Millions of dollars)MedicalLife SciencesInterventionalTotal
Goodwill as of September 30, 2021$10,240 $836 $12,810 $23,886 
Acquisitions (a)814 71 188 1,073 
Purchase price allocation adjustments1 — (2)(1)
Currency translation(145)(20)(171)(337)
Goodwill as of September 30, 2022$10,909 $888 $12,824 $24,621 
Divestitures and related adjustments (b)— — (218)(218)
Purchase price allocation adjustments (c)13 — — 13 
Currency translation33 9 64 105 
Goodwill as of September 30, 2023$10,955 $897 $12,670 $24,522 
(a)Primarily represents goodwill recognized in the Medical segment upon the Company's acquisition of Parata, which is further discussed in Note 11. Also includes goodwill recognized relative to certain acquisitions which were not material individually or in the aggregate.
(b)Represents goodwill derecognized upon the Company’s sale of its Surgical Instrumentation platform, as further discussed in Note 2.
(c)The purchase price allocation adjustments were primarily driven by an adjustment to tax-related balances recorded upon the finalization of the Parata acquisition allocation within one year of the transaction's closing.