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Goodwill and Other Intangibles, net
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangibles, net
Goodwill and Other Intangibles, net

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.

As of December 31, 2018, goodwill totaled $2.3 billion for the EVM reportable segment and $154 million for the AIT reportable segment.

The Company’s goodwill balance consists of five reporting units with an aggregate carrying value of $2.5 billion. The majority of the goodwill relates to the 2014 Enterprise acquisition. The Company completed its annual goodwill impairment testing during the fourth quarter of 2018 utilizing a quantitative approach. The estimated fair value of each reporting unit exceeded its carrying value by at least 40%. There is risk of future impairment to the extent that individual reporting unit performance does not meet projections. Additionally, if our current assumptions and estimates, including projected revenues and income growth rates, terminal growth rates, competitive and consumer trends, market-based discount rates, and other market factors, are not met, or if other valuation factors outside of our control change unfavorably, the estimated fair value of our reporting units could be adversely affected, leading to a potential impairment in the future.

No events occurred during the years ended December 31, 2018 and 2017 that indicated it was more likely than not that our goodwill was impaired. During the year ended December 31, 2016, goodwill impairment of $32 million was recorded related to the WLAN business divestiture and reflected within the EVM segment.

Other Intangibles, net
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


 
Amortization expense was $97 million, $184 million, and $229 million for fiscal years ended 2018, 2017 and 2016, respectively. Aside from amortization expense, the change in other intangible assets in 2018 relates to the addition of Xplore acquisition as well as foreign currency translation.

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