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Related Parties (Tables)
12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Summary of Compensation of Key Management Personnel
A summary of compensation of key management personnel is as follows.
For the years ended December 31,
 
2020
     2019 
Short-term employee benefits
 
$
69
 
    $67 
Post-employment benefits
 
 
5
 
     5 
Share-based payments
 
 
57
 
     55 
Termination benefits
 
 
 
     8 
Other long-term benefits
 
 
3
 
     2 
Total
 
$
  134
 
    $  137