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Provisions (Tables)
 9 Months Ended
Sep. 30, 2020
Statement [LineItems]  
Summary of Provisions
   As at 
   
September 30,
2020
   December 31,
2019		 
Decommissioning liability
  
$
60
 
  $100 
Office lease provision
  
 
35
 
   13 
  
 
 
   
 
 
 
Total
  
$
95
 
  $113 
  
 
 
   
 
 
 
Current portion
  
$
17
 
  $16 
Long-term portion
  
$
78
 
  $97 
  
 
 
   
 
 
 
Summary of Changes to Decommissioning Liability
Changes to the decommissioning liability were as follows:
 
   
Nine months ended
September 30, 2020
   Year ended
December 31, 2019		 
Balance, beginning of period
  
$
100
 
  $129 
Net liabilities added (disposed)
(1)
  
 
—  
 
   (6) 
Increase (decrease) due to changes in estimates
  
 
(42
) 
   (10) 
Liabilities settled
  
 
(9
) 
   (14) 
Transfers from (to) liabilities for assets held for sale
  
 
7
 
   (7) 
Accretion charges
  
 
4
 
   8 
  
 
 
   
 
 
 
Balance, end of period
  
$
60
 
  $100 
  
 
 
   
 
 
 
Current portion
  
$
8
 
  $13 
Long-term portion
  
$
52
 
  $87 
  
 
 
   
 
 
 
 
(1)
Includes additions from drilling activity, facility capital spending and disposals related to net property dispositions.
Summary of Changes to Office Lease Provision
Changes to the office lease provision were as follows:
 
   
Nine months ended
September 30, 2020
   Year ended
December 31, 2019		 
Balance, beginning of period
  
$
13
 
  $22 
Net additions (dispositions)
  
 
26
 
   (5) 
Increase (decrease) due to changes in estimates
  
 
1
 
   (3) 
Cash settlements
  
 
(7
) 
   (2) 
Accretion charges
  
 
2
 
   1 
  
 
 
   
 
 
 
Balance, end of period
  
$
35
 
  $13 
  
 
 
   
 
 
 
Current portion
  
$
9
 
  $3 
Long-term portion
  
$
26
 
  $10