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Intangible Assets
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
11.
INTANGIBLE ASSETS
Intangible assets consist of:
 
   
Remaining
weighted average
useful life in years
  
2020
   
2019
 
    
Cost
             
Customer relationship intangibles
  8  
$
348
 
  $333 
Computer software
  1  
 
463
 
   396 
Patents and licenses
  10  
 
282
 
   264 
   
 
  
 
 
   
 
 
 
      
 
1,093
 
   993 
    
Accumulated depreciation
             
Customer relationship intangibles
     
 
(150
) 
   (120) 
Computer software
     
 
(361
) 
   (310) 
Patents and licenses
     
 
(101
) 
   (79) 
   
 
  
 
 
   
 
 
 
      
$
481
 
  $484 
   
 
  
 
 
   
 
 
 
The Company recorded approximately $85 million and $93 million of amortization expense related to finite-lived intangible assets for the years ended December 31, 2020 and 2019, respectively. The Company currently estimates annual amortization expense to be $79 million for 2021, $68 million for 2022, $55 million for 2023, $47 million for 2024 and $44 million for 2025.