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OTHER LONG-TERM LIABILITIES
 12 Months Ended
Dec. 31, 2019
Deferred Costs, Noncurrent [Abstract]  
OTHER LONG-TERM LIABILITIES OTHER LONG-TERM LIABILITIES
at December 31
2019

 
2018

(millions of Canadian $)
 
 
 
 
Employee post-retirement benefits (Note 24)
540

 
569

Operating lease obligations (Note 9)
476

 
—

Long-term contract liabilities (Note 5)
226

 
121

Fair value of derivative contracts (Note 25)
81

 
42

Asset retirement obligations
62

 
90

Guarantees
32

 
12

Other
197

 
174

 
1,614

 
1,008