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Operating, Selling and General | 12 Months Ended
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Dec. 31, 2018
OPERATING, SELLING AND GENERAL |
OPERATING, SELLING AND GENERAL | 8. OPERATING, SELLING AND GENERAL Operating, Selling and General expense consists of the following:
($ millions) |  | 2018 |  | 2017 |
|  | (restated – note 5) |
Contract services(1) |  | 4 552 |  | 3 551 |
Employee costs(1) |  | 3 263 |  | 3 290 |
Materials |  | 765 |  | 706 |
Energy |  | 1 095 |  | 1 121 |
Equipment rentals and leases |  | 360 |  | 279 |
Travel, marketing and other |  | 538 |  | 241 |
|  | 10 573 |  | 9 188 |
(1) The company incurred $8.3 billion of contract services and employee costs for the year ended December 31, 2018 (2017 – $7.3 billion), of which $7.8 billion (2017 – $6.8 billion) was recorded in Operating, Selling and General expense and $0.5 billion was recorded as Property, Plant and Equipment (2017 – $0.5 billion). Employee costs include salaries, benefits and share-based compensation.

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- Definition The disclosure of general and administrative expenses. [Refer: Administrative expenses] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_10_e&doctype=Standard -URIDate 2018-03-16 + Details
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