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OPERATING, SELLING AND GENERAL EXPENSE | 12 Months Ended
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Dec. 31, 2020
OPERATING, SELLING AND GENERAL |
OPERATING, SELLING AND GENERAL | 8. Operating, Selling and General Expense Operating, Selling and General expense consists of the following:
($ millions) |  | 2020 |  | 2019 |
Contract services(1) |  | 4 165 |  | 4 380 |
Employee costs(1) |  | 2 813 |  | 3 641 |
Materials |  | 951 |  | 869 |
Energy |  | 1 113 |  | 1 129 |
Equipment rentals and leases |  | 361 |  | 345 |
Travel, marketing and other |  | 524 |  | 880 |
|  | 9 927 |  | 11 244 |
(1) | The company incurred $7.5 billion of contract services and employee costs for the year ended December 31, 2020 (2019 – $8.5 billion), of which $7.0 billion (2019 – $8.0 billion) was recorded in Operating, Selling and General expense and $0.5 billion was recorded as Property, Plant and Equipment (2019 – $0.5 billion). Employee costs include salaries, benefits and share-based compensation.

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