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OPERATING, SELLING AND GENERAL | 12 Months Ended
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Dec. 31, 2019
OPERATING, SELLING AND GENERAL |
OPERATING, SELLING AND GENERAL | 8. OPERATING, SELLING AND GENERAL Operating, Selling and General expense consists of the following:
($ millions) |  | 2019 |  | 2018 |
Contract services(1) |  | 4 380 |  | 4 552 |
Employee costs(1) |  | 3 641 |  | 3 263 |
Materials |  | 869 |  | 765 |
Energy |  | 1 129 |  | 1 095 |
Equipment rentals and leases |  | 345 |  | 360 |
Travel, marketing and other |  | 880 |  | 538 |
|  | 11 244 |  | 10 573 |
(1) | The company incurred $8.5 billion of contract services and employee costs for the year ended December 31, 2019 (2018 – $8.3 billion), of which $8.0 billion (2018 – $7.8 billion) was recorded in Operating, Selling and General expense and $0.5 billion was recorded as Property, Plant and Equipment (2018 – $0.5 billion). Employee costs include salaries, benefits and share-based compensation.

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