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Equity - Summary of Basic and Diluted Earnings Per Share (Detail) - CAD CAD / shares in Units, shares in Thousands, CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Basic and diluted earnings per share [abstract]
Net basic and diluted profit attributable to shareholders of the company	CAD 2,509	CAD 1,040
Weighted average shares outstanding	577,482	576,391
Dilutive effect of share options	8,910	6,496
Weighted average diluted shares outstanding	586,392	582,887
Basic earnings per share	CAD 4.34	CAD 1.80
Diluted earnings per share	CAD 4.28	CAD 1.78

X

- 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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- Definition

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]]

+ References

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The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

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

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