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OPERATING COSTS (Tables)
 12 Months Ended
Dec. 31, 2018
Operating Costs [Abstract]  
Disclosure of operating costs
  
Years ended December 31
 
 
2018

2017

(In millions of dollars)
 
(restated, see note 2)

 
 
 
Cost of equipment sales
2,284

2,022

Merchandise for resale
231

237

Other external purchases
4,509

4,497

Employee salaries, benefits, and stock-based compensation
2,089

2,111

 
 
 
Total operating costs
9,113

8,867