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Net Income (Loss) Per Share (Detail) - CAD CAD / shares in Units, shares in Millions, CAD in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net income (loss) per common share - basic
Net income (loss)	CAD 1,003	CAD 479	CAD 721	CAD 1,020
Weighted average number of common shares outstanding (millions of shares)	847.6	847.6	847.6	847.6
Net income (loss) per common share (dollars)	CAD 1.18	CAD 0.56	CAD 0.85	CAD 1.20
Net income (loss) per common share - diluted
Net income (loss)	CAD 1,003	CAD 479	CAD 721	CAD 1,020
Weighted average number of common shares outstanding (millions of shares)	847.6	847.6	847.6	847.6
Effect of share-based awards (millions of shares)	3.2	3.3	3.0	3.1
Weighted average number of common shares outstanding, assuming dilution (millions of shares)	850.8	850.9	850.6	850.7
Net income (loss) per common share (dollars)	CAD 1.18	CAD 0.56	CAD 0.85	CAD 1.20

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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