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Intangible Assets
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
10.    INTA
N
GIBLE ASSETS
Intangible assets consist of:
 
     Remaining
weighted average
useful life in years		     
2022
      2021  
Cost
                           
Customer relationship intangibles
      7     
$
388
 
    $ 386  
Computer software
      4     
 
474
 
      463  
Patents and licenses
      7     
 
304
 
      314  
             
 
 
     
 
 
  
             
 
1,166
 
      1,163  
Accumulated depreciation
                           
Customer relationship intangibles
            
 
(194
) 
      (175 ) 
Computer software
            
 
(362
) 
      (360 ) 
Patents and licenses
            
 
(158
) 
      (135 ) 
             
 
 
     
 
 
  
             
$
452
 
    $ 493  
             
 
 
     
 
 
  
The Company recorded $106 million and $114 million of amortization expense related to finite-lived intangible assets for the years ended December 31, 2022 and 2021, respectively. The Company currently estimates annual amortization expense to be $91 million for 2023, $77 million for 2024, $57 million for 2025, $50 million for 2026 and $43 million for 2027.