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

13. INTANGIBLE ASSETS

Intangible assets were as follows:

 

     Estimated weighted
average useful life
in years		      2018      2017  

Cost

         

Customer relationship intangibles [note 7]

      10      $ 415      $ 438  

Computer software

      2        291        348  

Patent and licenses

      12        340        342  
     

 

 

     

 

 

  
        1,046        1,128  

Accumulated depreciation

         

Customer relationship intangibles [note 7]

         (191 )       (162 ) 

Computer software

         (219 )       (263 ) 

Patent and licenses

         (76 )       (53 ) 
     

 

 

     

 

 

  
      $ 560      $ 650  
     

 

 

     

 

 

  

The Company recorded approximately $84 million and $125 million of amortization expense related to finite-lived intangible assets for the years ended December 31, 2018 and 2017, respectively. The Company currently estimates annual amortization expense to be $77 million for 2019, $75 million for 2020, $50 million for 2021, $44 million for 2022 and $41 million for 2023.