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Common Shares - Earnings per Common Share (Details) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings per share [abstract] |  |  |
Net earnings (loss) attributable to common shareholders | $ 52 | $ (248) | $ (190)
Basic and diluted weighted average number of common shares outstanding (millions) | 283 | 287 | 288
Net earnings (loss) per share attributable to common shareholders, basic and diluted (in CAD per share) | $ 0.18 | $ (0.86) | $ (0.66)

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- Definition The amount of earnings per share when the basic and diluted measurements are equal. [Refer: Basic earnings (loss) per share; Diluted earnings (loss) per share] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_85&doctype=Standard -URIDate 2018-03-16 + Details
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- References No definition available. + Details
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- Definition The profit (loss) attributable to ordinary equity holders of the parent equity. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2018-01-01 -Paragraph 70 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2018-03-01&anchor=para_70_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2018-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2018-03-01&anchor=para_70_b&doctype=Standard -URIDate 2018-03-16 + Details
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