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Intangible Assets
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
11.    INTANGIBLE ASSETS
Intangible assets consist of:
 
    
Remaining
weighted average
useful life in years
   
2021
      2020  
Cost
                       
Customer relationship intangibles
    7   
$
386
 
    $ 348  
Computer software
    1   
 
463
 
      463  
Patents and licenses
    7   
 
314
 
      282  
         
 
 
     
 
 
  
         
 
1,163
 
      1,093  
Accumulated depreciation
                       
Customer relationship intangibles
        
 
(175
) 
      (150 ) 
Computer software
        
 
(360
) 
      (361 ) 
Patents and licenses
        
 
(135
) 
      (101 ) 
         
 
 
     
 
 
  
         
$
493
 
    $ 481  
         
 
 
     
 
 
  
The Company recorded $114 million and $85 million of amortization expense related to finite-lived intangible assets for the years ended December 31, 2021 and 2020, respectively. The Company currently estimates annual amortization expense to be $111 million for 2022, $77 million for 2023, $59 million for 2024, $54 million for 2025 and $51 million for 2026.