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Other long-term obligations (Tables)
 6 Months Ended
Jun. 30, 2020
Other Long-Term Obligations
                   As at
June 30		      As at
Dec 31		  
millions of Canadian dollars
                   
2020
      2019  
Employee retirement benefits
(a)
         
 
1,977
 
      1,822  
Asset retirement obligations and other environmental liabilities
(b)
         
 
1,384
 
      1,388  
Share-based incentive compensation liabilities
         
 
54
 
      65  
Operating lease liability
(c)
         
 
107
 
      143  
Other obligations
         
 
231
 
      219  
Total other long-term obligations
   
 
 
 
   
 
 
 
   
 
3,753
 
      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 $124 million in current liabilities (2019 - $124 million).
(c)
Total operating lease liability also included $106 million in current liabilities (2019 - $115 million). In addition to the total operating lease liability, additional undiscounted commitments for leases not yet commenced totalled $27 million (2019 - $6 million).