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NET EARNINGS (LOSS) PER COMMON SHARE - Schedule of Basic and Diluted Net Earnings (Loss) per Common Share(Details) - CAD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Weighted average ordinary shares and adjusted weighted average ordinary shares [abstract]
Effect of dilutive stock options (thousands of shares)	7,729	0	0
Weighted average common shares outstanding – basic (thousands of shares)	1,175,094	1,100,471	1,093,862
Weighted average common shares outstanding – diluted (thousands of shares)	1,182,823	1,100,471	1,093,862
Net earnings (loss)	$ 2,397	$ (204)	$ (637)
Net earnings (loss) per common share - basic (in CAD per share)	$ 2.04	$ (0.19)	$ (0.58)
Net earnings (loss) per common share - diluted (in CAD per share)	$ 2.03	$ (0.19)	$ (0.58)

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- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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