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OPERATING COSTS (Tables)
 12 Months Ended
Dec. 31, 2020
Operating Costs [Abstract]  
Disclosure of operating costs
  Years ended December 31
(In millions of dollars)20202019
Cost of equipment sales1,946 2,254 
Merchandise for resale261 242 
Other external purchases4,005 4,360 
Employee salaries, benefits, and stock-based compensation 1
1,847 2,005 
Total operating costs8,059 8,861 
1    Net of government grants received (see note 2).