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GOODWILL AND OTHER INTANGIBLE ASSETS
3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS
GOODWILL AND OTHER INTANGIBLE ASSETS
The following table shows the carrying amount of goodwill:

Goodwill
 
In millions
Net goodwill at Dec 31, 2018
$
13,848

Foreign currency impact
(36
)
Net goodwill at Mar 31, 2019
$
13,812



The following table provides information regarding TDCC’s other intangible assets:

Other Intangible Assets
Mar 31, 2019
Dec 31, 2018
In millions
Gross
Carrying
Amount
Accum
Amort
Net
Gross
Carrying
Amount
Accum
Amort
Net  
Intangible assets with finite lives:
 
 
 
 
 
 
Developed technology
$
3,253

$
(1,996
)
$
1,257

$
3,255

$
(1,934
)
$
1,321

Software
1,539

(900
)
639

1,529

(876
)
653

Trademarks/tradenames
680

(638
)
42

688

(631
)
57

Customer-related
4,898

(2,211
)
2,687

4,911

(2,151
)
2,760

Other
236

(167
)
69

243

(170
)
73

Total other intangible assets, finite lives
$
10,606

$
(5,912
)
$
4,694

$
10,626

$
(5,762
)
$
4,864

In-process research and development
49


49

49


49

Total other intangible assets
$
10,655

$
(5,912
)
$
4,743

$
10,675

$
(5,762
)
$
4,913



The following table provides information regarding amortization expense related to other intangible assets:

Amortization Expense
Three Months Ended
In millions
Mar 31, 2019
Mar 31, 2018
Other intangible assets, excluding software
$
154

$
159

Software, included in “Cost of sales”
$
25

$
23



Total estimated amortization expense for 2019 and the five succeeding fiscal years is as follows:

Estimated Amortization Expense
In millions
2019
$
659

2020
$
623

2021
$
594

2022
$
525

2023
$
492

2024
$
456