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Intangible Assets
 12 Months Ended
Dec. 31, 2016
Finite-Lived Intangible Assets, Net [Abstract]  
Intangible Assets
13. INTANGIBLE ASSETS

Intangible assets were as follows:

 

     Estimated weighted
average useful life
in years		      2016      2015  

Cost

         

Customer relationship intangibles [note 7]

      12      $ 392      $ 134  

Computer software

      4        316        278  

Patent and licenses

      15        278        39  
     

 

 

     

 

 

  
        986        451  

Accumulated depreciation

         

Customer relationship intangibles [note 7]

         (96 )       (53 ) 

Computer software

         (242 )       (221 ) 

Patent and licenses

         (27 )       (8 ) 
     

 

 

     

 

 

  
      $ 621      $ 169  
     

 

 

     

 

 

  

The Company recorded approximately $100 million and $48 million of amortization expense related to definite-lived intangible assets for the years ended December 31, 2016 and 2015, respectively. The Company currently estimates annual amortization expense to be $90 million for 2017, $82 million for 2018, $66 million for 2019, $47 million for 2020 and $44 million for 2021.