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Intangible Assets (Tables)
 6 Months Ended
Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of 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

 
 
Reconciliation of Goodwill by Business Segment
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.