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Operating costs (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Labour costs |  |
Wages, salaries and related taxes and benefits | $ (4,158) | $ (4,016)
Post-employment benefit plans service cost (net of capitalized amounts) | (242) | (224)
Other labour costs | (1,056) | (1,036)
Less: Capitalized labour | 1,043 | 967
Total labour costs | (4,413) | (4,309)
Cost of revenues | (7,056) | (6,705)
Other operating costs | (2,072) | (1,917)
Total operating costs | (13,541) | (12,931)
Research and development expense | $ 119 | $ 147

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_103&doctype=Standard -URIDate 2017-03-09 + Details
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