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OTHER LONG-TERM LIABILITIES (Tables)
 12 Months Ended
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]  
Disclosure of other long-term liabilities
As at December 31
(In millions of dollars)Note20202019
Deferred pension liability23 590 465 
Supplemental executive retirement plan23 92 73 
Stock-based compensation25 39 47 
Derivative instruments17 318 90 
Contract liabilities5 69 — 
Other 41 29 
Total other long-term liabilities 1,149 704