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Other Long-Term Liabilities
 12 Months Ended
Dec. 31, 2020
Other Liabilities Disclosure [Abstract]  
Other Long-Term Liabilities
18.
OTHER LONG-TERM LIABILITIES
Other long-term liabilities consist of:
 
   
         
   
         
 
   
2020
   
2019
 
   
Long-term portion of income taxes payable
  
$
199
 
  
$
234
 
Deferred revenue
  
 
52
 
  
 
74
 
Asset retirement obligation
  
 
39
 
  
 
34
 
Long-term portion of fair value of hedges
[note 21]
  
 
5
 
  
 
8
 
Other
  
 
37
 
  
 
21
 
   
 
 
   
 
 
 
   
$
332
 
  
$
371