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 |