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OPERATING COSTS (Tables)
 12 Months Ended
Dec. 31, 2019
Operating Costs [Abstract]  
Disclosure of operating costs
  
Years ended December 31
 
(In millions of dollars)
2019

2018

 
 
 
Cost of equipment sales
2,254

2,284

Merchandise for resale
242

231

Other external purchases
4,360

4,509

Employee salaries, benefits, and stock-based compensation
2,005

2,089

 
 
 
Total operating costs
8,861

9,113