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Common Shares - Earnings per Common Share (Details) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	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

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No definition available.

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- Definition

The profit (loss) attributable to ordinary equity holders of the parent equity. [Refer: Profit (loss)]

+ References

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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.

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