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Discontinued operations - Income Statement (Details) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Discontinued operations |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Revenues |  | $ 118 | $ 171
Operating costs |  | (57) | (71)
Depreciation |  | (18) | (38)
Amortization |  | (7) | (16)
Interest expense |  |  |
Interest expense |  | (6) | (7)
Other (expense) income |  | (8) | (6)
Income taxes |  | (7) | (4)
Net earnings attributable to common shareholders before gain on sale |  | 15 | 29
Gain on sale (net of taxes of $3 million) |  | 211 | 0
Net earnings attributable to common shareholders |  | 226 | 29
Revenues |  | 22,883 | 23,793
Operating costs |  | (13,276) | (13,787)
Depreciation |  | (3,475) | (3,458)
Amortization |  | (929) | (886)
Interest expense |  | (1,110) | (1,125)
Other (expense) income |  | (194) | 95
Gain on sale (net of taxes of $3 million) | $ 211 |  |
Tax expense (income) relating to gain (loss) on discontinuance |  | (3) |
Net earnings attributable to common shareholders |  | $ 226 | $ 29

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- Definition The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The gain (loss) recognised on the measurement to fair value less costs to sell or on the disposal of the assets or disposal group(s) constituting the discontinued operation. [Refer: Discontinued operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2020-01-01 -Paragraph 33 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2020-en-r&anchor=para_33_b_iii&doctype=Standard -URIDate 2020-01-01 + Details
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