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Intangible Assets
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

Intangible assets consisted of:
 
As of March 31, 2018
 
As of December 31, 2017
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Amortized Intangible Assets
 
 
 
 
 
 
 
 
 
 
 
License agreements
$
294

 
$
147

 
$
147

 
$
281

 
$
140

 
$
141

Customer relationships
246

 
127

 
119

 
242

 
119

 
123

Other
52

 
19

 
33

 
51

 
18

 
33

Total
$
592

 
$
293

 
$
299

 
$
574

 
$
277

 
$
297

 
 
 
 
 
 
 
 
 
 
 
 
Unamortized Intangible Assets
 
 
 
 
 
 
 
 
 
 
 
Goodwill (a)
$
1,085

 
 
 
 
 
$
1,073

 
 
 
 
Trademarks
$
550

 
 
 
 
 
$
553

 
 
 
 
_________
(a) 
The increase in the carrying amount since December 31, 2017, primarily reflects currency translation.

For the three months ended March 31, 2018 and 2017, amortization expense related to amortizable intangible assets was approximately $14 million and $15 million, respectively. Based on the Company’s amortizable intangible assets at March 31, 2018, the Company expects amortization expense of approximately $38 million for the remainder of 2018, $46 million for 2019, $44 million for 2020, $31 million for 2021, $25 million for 2022 and $22 million for 2023, excluding effects of currency exchange rates.