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Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Summary of Class A Common Shares and Class B Subordinate Voting Shares Issued and Outstanding |
b) | Class A Common Shares and Class B Subordinate Voting Shares Issued and Outstanding
Shares (in 000’s) |  | Class A Common Shares |  |  | Class B Subordinate Voting Shares |
As at January 1, 2016 |  |  | 9,353 |  |  |  | 566,899 |
Options exercised (c) |  |  | — |  |  |  | 647 |
As at December 31, 2016 |  |  | 9,353 |  |  |  | 567,546 |
Class A share conversion |  |  | (1,576 | ) |  |  | 1,576 |
Options exercised (c) |  |  | — |  |  |  | 2,275 |
Acquired and cancelled pursuant to normal course issuer bid (h) |  |  | — |  |  |  | (5,891 | )
As at December 31, 2017 |  |  | 7,777 |  |  |  | 565,506 |
Summary of Weighted Average Assumptions | The weighted average fair value of Class B share options granted in the year was estimated at $8.32 per option (2016 — $1.81) at the grant date based on the Black-Scholes option-pricing model using the following assumptions:
|  | 2017 |  |  | 2016 |
Weighted average exercise price |  | $ | 27.79 |  |  | $ | 5.48 |
Dividend yield |  |  | 2.20 | % |  |  | 1.85 | %
Risk-free interest rate |  |  | 1.06 | % |  |  | 0.72 | %
Expected option life |  |  | 4.2 years |  |  |  | 4.2 years |
Expected volatility |  |  | 42 | % |  |  | 46 | %
Forfeiture rate |  |  | 0.36 | % |  |  | 0.96 | %
Summary of Outstanding Share Options | Outstanding share options are as follows:
|  | 2017 |  |  | 2016 |
|  | Share Options (in 000’s) |  |  | Weighted Average Exercise Price |  |  | Share Options (in 000’s) |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 22,854 |  |  | $ | 18.38 |  |  |  | 15,929 |  |  | $ | 26.53 |
Granted |  |  | 2,011 |  |  |  | 27.79 |  |  |  | 8,946 |  |  |  | 5.48 |
Exercised |  |  | (2,275 | ) |  |  | 11.47 |  |  |  | (647 | ) |  |  | 12.15 |
Forfeited |  |  | (78 | ) |  |  | 16.25 |  |  |  | (219 | ) |  |  | 10.74 |
Expired |  |  | (444 | ) |  |  | 40.40 |  |  |  | (1,155 | ) |  |  | 35.73 |
Outstanding at end of year |  |  | 22,068 |  |  | $ | 19.52 |  |  |  | 22,854 |  |  | $ | 18.38 |
Vested and exercisable at end of year |  |  | 12,266 |  |  | $ | 24.94 |  |  |  | 9,090 |  |  | $ | 29.70 |
Summary of Information Relating to Share Options Outstanding | Information relating to share options outstanding at December 31, 2017, is as follows:
Outstanding Share Options (in 000’s) |  | Exercise Price Range |  |  | Weighted Average Remaining Life of Outstanding Options (months) |
8,018 |  | $ | 4.15 — $12.35 |  |  |  | 91 |
5,083 |  | $ | 12.36 — $20.14 |  |  |  | 86 |
2,734 |  | $ | 20.15 — $26.79 |  |  |  | 74 |
4,527 |  | $ | 26.80 — $36.85 |  |  |  | 77 |
1,706 |  | $ | 36.86 — $58.80 |  |  |  | 45 |
22,068 |  | $ | 4.15 — $58.80 |  |  |  | 81 |
Summary of Outstanding Units | The outstanding Units are summarized in the following table:
|  | 2017 |  |  | 2016 |
(in 000’s) |  | Outstanding |  |  | Vested |  |  | Outstanding |  |  | Vested |
DSUs |  |  | 2,648 |  |  |  | 2,423 |  |  |  | 2,597 |  |  |  | 2,119 |
RSUs |  |  | 2,823 |  |  |  | 1,699 |  |  |  | 3,316 |  |  |  | 1,327 |
PSUs |  |  | 1,517 |  |  |  | 869 |  |  |  | 1,554 |  |  |  | 616 |
PDSUs |  |  | 70 |  |  |  | 20 |  |  |  | — |  |  |  | — |
|  |  | 7,058 |  |  |  | 5,011 |  |  |  | 7,467 |  |  |  | 4,062 |
Summary of Accumulated Other Comprehensive Income (Loss) |
e) | Accumulated Other Comprehensive Income
(CAD$ in millions) |  | 2017 |  |  | 2016 |
Accumulated other comprehensive income — beginning of year |  | $ | 422 |  |  | $ | 426 |
Currency translation differences: |  |  |  |  |  |  |  |
Unrealized losses on translation of foreign subsidiaries |  |  | (488 | ) |  |  | (201 | )
Foreign exchange differences on debt designated as a hedge of our investment in foreign subsidiaries (net of taxes of $(46) and $(27)) |  |  | 341 |  |  |  | 180 |
|  |  | (147 | ) |  |  | (21 | )
Available-for-sale financial assets: |  |  |  |  |  |  |  |
Unrealized gains (losses) (net of taxes of $1 and $(6)) |  |  | (4 | ) |  |  | 45 |
Gains reclassified to profit (net of taxes of $1 and $4) |  |  | (6 | ) |  |  | (29 | )
|  |  | (10 | ) |  |  | 16 |
Share of other comprehensive income (loss) of associates and joint ventures |  |  | (1 | ) |  |  | 1 |
Remeasurements of retirement benefit plans (net of taxes of $(55) and $(7)) |  |  | 129 |  |  |  | 19 |
Total other comprehensive income (loss) |  |  | (29 | ) |  |  | 15 |
Less remeasurements of retirement benefit plans recorded in retained earnings |  |  | (129 | ) |  |  | (19 | )
Accumulated other comprehensive income — end of year |  | $ | 264 |  |  | $ | 422 |
f) | Earnings Per Share
Summary of Basic and Diluted Earnings Per Share | The following table reconciles our basic and diluted earnings per share:
(CAD$ in millions, except per share data) |  | 2017 |  |  | 2016 |
Net basic and diluted profit attributable to shareholders of the company |  | $ | 2,509 |  |  | $ | 1,040 |
Weighted average shares outstanding (000’s) |  |  | 577,482 |  |  |  | 576,391 |
Dilutive effect of share options |  |  | 8,910 |  |  |  | 6,496 |
Weighted average diluted shares outstanding (000’s) |  |  | 586,392 |  |  |  | 582,887 |
Basic earnings per share |  | $ | 4.34 |  |  | $ | 1.80 |
Diluted earnings per share |  | $ | 4.28 |  |  | $ | 1.78 |

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