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Stock-Based Compensation - Schedule of Options Outstanding (Detail) shares in Millions, pure in Millions | 12 Months Ended
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Dec. 31, 2018 CAD ($) shares | Dec. 31, 2017 CAD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [abstract] |  |
Number of options, Beginning balance | 25 | 30
Number of options, Granted | 3 | 4
Number of options, Exercised | (3) | (7)
Number of options' Expired | (1) | (1)
Number of options' Forfeited | (1) | (1)
Number of options, Ending balance | shares | 23 | 25
Number of options, Exercisable, Ending balance | 9 | 12
Weighted average exercise price, Beginning balance | $ 20.45 | $ 19.80
Weighted average exercise price, Granted | 24.52 | 24.56
Weighted average exercise price, Exercised | 17.77 | 16.03
Weighted average exercise price, Expired | 37.35 | 39.47
Weighted average exercise price, Forfeited | 21.24 | 20.86
Weighted average exercise price, Ending balance | 20.29 | 20.45
Weighted average exercise price, Exercisable, Ending balance | $ 18.08 | $ 19.93

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