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Intangible Assets
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
12.

INTANGIBLE ASSETS

Intangible assets were as follows:

 

     Estimated weighted
average useful
life in years		      2017      2016  

Cost

         

Customer relationship intangibles [note 6]

      10      $ 438      $ 392  

Computer software

      3        348        316  

Patent and licenses

      13        342        278  
     

 

 

     

 

 

  
        1,128        986  

Accumulated depreciation

         

Customer relationship intangibles [note 6]

         (162 )       (96 ) 

Computer software

         (263 )       (242 ) 

Patent and licenses

         (53 )       (27 ) 
     

 

 

     

 

 

  
      $ 650      $ 621  
     

 

 

     

 

 

  

The Company recorded approximately $125 million and $100 million of amortization expense related to finite-lived intangible assets for the years ended December 31, 2017 and 2016, respectively. The Company currently estimates annual amortization expense to be $124 million for 2018, $91 million for 2019, $72 million for 2020, $62 million for 2021 and $59 million for 2022.