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Intangible Assets
 6 Months Ended
Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
Intangible assets consisted of:
 
March 31, 2020
 
September 30, 2019
(Millions of dollars)
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
Amortized intangible assets
 
 
 
 
 
 
 
Developed technology
$
13,985

 
$
3,440

 
$
13,960

 
$
2,906

Customer relationships
4,606

 
1,345

 
4,608

 
1,183

Product rights
106

 
61

 
110

 
60

Trademarks
407

 
110

 
407

 
102

Patents and other
493

 
315

 
445

 
305

Amortized intangible assets
$
19,597

 
$
5,271

 
$
19,530

 
$
4,555

Unamortized intangible assets
 
 
 
 
 
 
 
Acquired in-process research and development (a)
$
46

 
 
 
$
1

 
 
Trademarks
2

 
 
 
2

 
 
Unamortized intangible assets
$
48

 
 
 
$
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 March 31, 2020 and 2019 was $347 million and $376 million, respectively. Intangible amortization expense for the six months ended March 31, 2020 and 2019 was $693 million and $754 million, respectively.
The following is a reconciliation of goodwill by business segment:
(Millions of dollars)
Medical
 
Life Sciences
 
Interventional
 
Total
Goodwill as of September 30, 2019
$
9,989

  
$
772

 
$
12,615

  
$
23,376

Acquisitions (a)
10

 
58

 
—

 
68

Currency translation
(2
)
 
(1
)
 
(26
)
 
(29
)
Goodwill as of March 31, 2020
$
9,997

  
$
828

 
$
12,589

  
$
23,415

(a)
Represents goodwill recognized relative to certain acquisitions which were not material individually or in the aggregate.