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Goodwill and Other Intangibles, net (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Net Carrying Value of Goodwill
Changes in the net carrying value amount of goodwill were as follows (in millions):
 
Total
Goodwill as of December 31, 2016
$
2,458

Foreign exchange impact
7

Goodwill as of December 31, 2017
2,465

Xplore acquisition(1)
35

Foreign exchange impact
(5
)
Goodwill as of December 31, 2018
$
2,495


(1) See Note 5, Business Acquisition and Divestiture for detail on the Xplore acquisition.
Amortized Intangible Assets
The balances in Other Intangibles, net consisted of the following (in millions):
 
As of December 31, 2018
 
As of December 31, 2017
 
Gross Carrying Amount
 
Accumulated
Amortization
 
Net
 
Gross Carrying Amount
 
Accumulated
Amortization
 
Net
Amortized intangible assets
 
 
 
 
 
 
 
 
 
 
 
Current technology
$
40

 
$
(26
)
 
$
14

 
$
24

 
$
(23
)
 
$
1

Trade Names
41

 
(41
)
 
—

 
41

 
(41
)
 
—

Unpatented technology
241

 
(221
)
 
20

 
242

 
(205
)
 
37

Patent and patent rights
233

 
(223
)
 
10

 
235

 
(215
)
 
20

Customer relationships
493

 
(305
)
 
188

 
481

 
(240
)
 
241

Total
$
1,048

 
$
(816
)
 
$
232

 
$
1,023

 
$
(724
)
 
$
299


 
Schedule of Future Amortization Expense
Estimated future intangible asset amortization expense is as follows (in millions):
Year Ended December 31,
Amount
2019
$
87

2020
42

2021
41

2022
35

2023
6

Thereafter
21

Total
$
232