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Stock-Based Compensation - Schedule of Range of Exercise Prices of Outstanding Share Options (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($)
Disclosure of range of exercise prices of outstanding share options [Line Items] |  |  |
Number of options, Options outstanding | 23,000,000 | 25,000,000 | 30,000,000
Weighted average exercise price, Options outstanding | $ 20.29 | $ 20.45 | $ 19.80
Weighted average remaining contractual life (in years) | 5.49 |  |
Number of options, Options exercisable | 9,000,000 | 12,000,000 |
Weighted average exercise price, Options exercisable | $ 18.08 | $ 19.93 |
Weighted average remaining contractual life (in years), Options exercisable | 2.37 |  |
$12.64 - $20.99 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [Line Items] |  |  |
Number of options, Options outstanding | 11,000,000 |  |
Weighted average exercise price, Options outstanding | $ 17.27 |  |
Weighted average remaining contractual life (in years) | 4.00 |  |
Number of options, Options exercisable | 7,000,000 |  |
Weighted average exercise price, Options exercisable | $ 17.06 |  |
Weighted average remaining contractual life (in years), Options exercisable | 2.09 |  |
$21.00 - $24.93 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [Line Items] |  |  |
Number of options, Options outstanding | 12,000,000 |  |
Weighted average exercise price, Options outstanding | $ 23.26 |  |
Weighted average remaining contractual life (in years) | 6.95 |  |
Number of options, Options exercisable | 2,000,000 |  |
Weighted average exercise price, Options exercisable | $ 21.27 |  |
Weighted average remaining contractual life (in years), Options exercisable | 3.25 |  |

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