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Intangible Assets (Tables)
 9 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Intangible Assets
Intangible assets consisted of:
 
June 30, 2019
 
September 30, 2018
(Millions of dollars)
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
Amortized intangible assets
 
 
 
 
 
 
 
Developed technology
$
13,972

 
$
2,638

 
$
13,966

 
$
1,782

Customer relationships
4,610

 
1,102

 
4,584

 
861

Product rights
115

 
60

 
121

 
58

Trademarks
407

 
97

 
407

 
84

Patents and other
433

 
301

 
397

 
288

Amortized intangible assets
$
19,537

 
$
4,198

 
$
19,475

 
$
3,073

Unamortized intangible assets
 
 
 
 
 
 
 
Acquired in-process research and development (a)
$
1

 
 
 
$
37

 
 
Trademarks
2

 
 
 
2

 
 
Unamortized intangible assets
$
3

 
 
 
$
39

 
 

(a)
The decrease in the carrying value of assets at June 30, 2019 primarily reflects a write-down recorded in the third quarter by the Interventional segment's Surgery unit.
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, 2018
$
10,054

  
$
775

 
$
12,771

  
$
23,600

Divestiture-related adjustments
—

 
3

 
—

 
3

Purchase accounting adjustments (a)
(15
)
 
—

 
(75
)
 
(90
)
Currency translation
(12
)
 
(3
)
 
—

 
(14
)
Goodwill as of June 30, 2019
$
10,027

  
$
775

 
$
12,696

  
$
23,498

(a)
The purchase accounting adjustments were primarily driven by adjustments to tax-related balances recorded upon the finalization of the Bard acquisition allocation within one year of the transaction's closing.