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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Capital, Reserves And Other Equity Interest [Abstract]
Net earnings (loss) attributable to common shareholders	$ (336)	$ 52	$ (248)
Basic and diluted weighted average number of common shares outstanding (millions)	275	283	287
Net earnings (loss) per share attributable to common shareholders, basic and diluted (in CAD per share)	$ (1.22)	$ 0.18	$ (0.86)

X

- 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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- Definition

The profit (loss) attributable to ordinary equity holders of the parent entity. [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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Share Capital, Reserves And Other Equity Interest [Abstract]

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