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Intangible Assets
3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

Intangible assets consisted of:
 
As of March 31, 2017
 
As of December 31, 2016
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Amortized Intangible Assets
 
 
 
 
 
 
 
 
 
 
 
License agreements
$
260

 
$
115

 
$
145

 
$
261

 
$
109

 
$
152

Customer relationships
226

 
96

 
130

 
224

 
90

 
134

Other
45

 
12

 
33

 
46

 
12

 
34

Total
$
531

 
$
223

 
$
308

 
$
531

 
$
211

 
$
320

 
 
 
 
 
 
 
 
 
 
 
 
Unamortized Intangible Assets
 
 
 
 
 
 
 
 
 
 
 
Goodwill
$
1,013

 
 
 
 
 
$
1,007

 
 
 
 
Trademarks
$
551

 
 
 
 
 
$
550

 
 
 
 


For the three months ended March 31, 2017 and 2016, amortization expense related to amortizable intangible assets was approximately $15 million and $17 million, respectively. Based on the Company’s amortizable intangible assets at March 31, 2017, the Company expects amortization expense of approximately $40 million for the remainder of 2017, $41 million for 2018, $37 million for 2019, $37 million for 2020, $27 million for 2021 and $22 million for 2022, excluding effects of currency exchange rates.