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OPERATING COSTS (Tables) | 12 Months Ended
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Dec. 31, 2017
Operating Costs [Abstract] |
Disclosure of operating costs |
| Years ended December 31 |
(In millions of dollars) | 2017 |  | 2016 |
Cost of equipment sales and direct sales channel subsidies | 2,039 |  | 1,954 |
Merchandise for resale | 237 |  | 209 |
Other external purchases | 4,429 |  | 4,435 |
Employee salaries and benefits and stock-based compensation | 2,120 |  | 2,073 |
Total operating costs | 8,825 |  | 8,671 |

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