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Intangible Assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
13.    INTANGIBLE ASSETS
Intangible assets were as follows:
 
   Estimated weighted
average useful
 
life
in years		   
2019
   2018 
Cost
               
Customer relationship intangibles
[note 7]
   9   
$
429
 
  $415 
Computer software
   1   
 
396
 
   291 
Patent and licenses
   11   
 
264
 
   340 
   
 
 
   
 
 
   
 
 
 
        
 
1,089
 
   1,046 
Accumulated depreciation
               
Customer relationship intangibles
[note 7]
       
 
(216
)
 
   (191) 
Computer software
       
 
(310
)
 
   (219) 
Patent and licenses
       
 
(79
)
 
   (76) 
        
 
 
   
 
 
 
        
$
484
 
  $560 
        
 
 
   
 
 
 
The Company recorded approximately $93 million and $84 million of amortization expense related to finite-lived intangible assets for the years ended December 31, 2019 and 2018, respectively. The Company currently estimates annual amortization expense to be $85 million for 2020, $66 million for 2021, $53 million for 2022, $47 million for 2023 and $43 million for 2024.