EARNINGS PER SHARE (Details) - CAD / shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Denominator - Number of shares (in millions):
Weighted average number of shares outstanding - basic	515,000,000	515,000,000
Employee stock options and restricted share units (in shares)	2,000,000	2,000,000
Weighted average number of shares outstanding - diluted	517,000,000	517,000,000
Basic (in dollars per share)	CAD 3.32	CAD 1.62
Diluted (in dollars per share)	CAD 3.31	CAD 1.62
Antidilutive securities (in shares)	489,835	0

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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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), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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