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Intangible Assets
 12 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets
Intangible assets at September 30 consisted of:
 
2018
 
2017
(Millions of dollars)
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
Amortized intangible assets
 
 
 
 
 
 
 
Developed technology
$
13,966

 
$
1,782

 
$
3,508

 
$
1,029

Customer relationships
4,584

 
861

 
3,393

 
564

Product rights
121

 
58

 
131

 
54

Trademarks
407

 
84

 
408

 
65

Patents and other
397

 
288

 
370

 
274

Amortized intangible assets
$
19,475

 
$
3,073

 
$
7,811

 
$
1,986

 
 
 
 
 
 
 
 
Unamortized intangible assets
 
 
 
 
 
 
 
Acquired in-process research and development
$
37

 
 
 
$
67

 
 
Trademarks
2

 
 
 
2

 
 
Unamortized intangible assets
$
39

 
 
 
$
69

 
 

Additional disclosures regarding the increases to the developed technology assets and customer relationships as a result of the Bard acquisition are provided in Note 9. Intangible amortization expense was $1.255 billion, $0.533 billion and $0.552 billion in 2018, 2017 and 2016, respectively. The estimated aggregate amortization expense for the fiscal years ending September 30, 2019 to 2023 are as follows: 2019 — $1.472 billion; 2020 — $1.350 billion; 2021 — $1.347 billion; 2022 — $1.338 billion; 2023 — $1.333 billion.
The following is a reconciliation of goodwill by business segment:
(Millions of dollars)
Medical
 
Life Sciences
 
Interventional
 
Total
Goodwill as of September 30, 2016
$
6,688

 
$
731

 
$
—

 
$
7,419

Acquisitions (a)
119

 
24

 
—

 
143

Divestiture (b)
(25
)
 
—

 
—

 
(25
)
Purchase accounting adjustments
4

 
—

 
—

 
4

Currency translation
16

 
6

 
—

 
22

Goodwill as of September 30, 2017
$
6,802

 
$
761

 
$
—

 
$
7,563

Acquisitions (c)
3,923

 
76

 
11,218

 
15,217

Divestiture (b)
—

 
(59
)
 
(57
)
 
(116
)
Reallocation of goodwill for change in segment and reporting unit composition (d)
(877
)
 
—

 
877

 
—

Purchase accounting adjustments (e)
228

 
(2
)
 
732

 
959

Currency translation
(22
)
 
(2
)
 
—

 
(24
)
Goodwill as of September 30, 2018
$
10,054

 
$
775

 
$
12,771

 
$
23,600

(a)
Represents 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 certain businesses, as further discussed in Note 10.
(c)
Represents goodwill primarily recognized upon the Company's acquisition of Bard in fiscal year 2018, which is further discussed in Note 9. Also includes goodwill recognized relative to certain acquisitions which were not material individually or in the aggregate.
(d)
Represents the reassignment of goodwill, determined based upon a relative fair value allocation approach, associated with the movement of certain product offerings which were previously reported in the Medical segment and which are now reported in the Interventional segment as further discussed in Note 6.
(e)
The purchase accounting adjustments increasing goodwill were primarily driven by the valuation of Bard developed technology assets, the associated deferred tax liability changes, increases to legal reserves and the alignment of the combined organization's accounting policies with respect to accrued liabilities and other accounts.