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Assets and liabilities held for sale (Tables)
 9 Months Ended
Sep. 30, 2020
Statement [LineItems]  
Disclosure of Detailed Information about Assets and Liabilities Held for Sale
Assets and liabilities classified as held for sale consisted of the following:
 
   As at 
   
September 30,
2020
   December 31,
2019		 
Assets held for sale
    
Cash
  
$
—  
 
  $2 
Accounts receivable
  
 
—  
 
   4 
Property, plant and equipment
  
 
—  
 
   77 
  
 
 
   
 
 
 
  
$
—  
 
  $83 
  
 
 
   
 
 
 
Liabilities related to assets held for sale
    
Accounts payable and accrued liabilities
  
$
—  
 
  $6 
Decommissioning liability
  
 
—  
 
   7 
  
 
 
   
 
 
 
  
$
—  
 
  $13