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Other long-term obligations (Tables)
 12 Months Ended
Dec. 31, 2020
Other Long-Term Obligations
millions of Canadian dollars
   
2020
                  2019  
Employee retirement benefits
(a) (note 5)
   
 
2,105
 
      1,822  
Asset retirement obligations and other environmental liabilities
(b) (c)
   
 
1,676
 
      1,388  
Share-based incentive compensation liabilities
(note 8)
   
 
45
 
      65  
Operating lease liability
(note 14)
   
 
95
 
      143  
Other obligations
   
 
179
 
      219  
Total other long-term obligations
   
 
4,100
 
      3,637  
(a)
Total recorded employee retirement benefits obligations also included $58 million in current liabilities (2019 – $58 million).
(b)
Total asset retirement obligations and other environmental liabilities also included $100 million in current liabilities (2019 – $124 million).
(c)
For 2020, the asset retirement obligations were discounted at 6 percent (2019 - 6 percent).
Schedule of Asset Retirement Obligations
 
Asset retirement obligations incurred in the current period were Level 3 fair value measurements. The following table summarizes the activity in the liability for asset retirement obligations:
millions of Canadian dollars   
2020
                 2019                 2018  
Balance as at January 1
   
 
1,400
 
     1,417  
 
 
 1,397  
Additions (deductions)
   
 
265
 
     (23 ) 
 
 
 (5 ) 
Accretion
   
 
82
 
     80  
 
 
 85  
Settlement
   
 
(73
) 
     (74 ) 
 
 
 
(60
)
Balance as at December 31
   
 
1,674
 
     1,400  
 
 
 
1,417