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Share-based payments - Stock Options Exercise Prices and Weighted Average Remaining Life (Details) | Dec. 31, 2017 CAD ($) shares year | Dec. 31, 2016 CAD ($) shares | Dec. 31, 2015 CAD ($) shares
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Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
NUMBER OF SHARES | shares | 10,490,249 | 10,242,162 | 9,666,904
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year | 4.68 |  |
WEIGHTED AVERAGE EXERCISE PRICE ($) | $ 55 | $ 52 | $ 48
$30–$39 |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
NUMBER OF SHARES | shares | 35,408 |  |
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year | 0.14 |  |
WEIGHTED AVERAGE EXERCISE PRICE ($) | $ 36 |  |
$30–$39 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 30 |  |
$30–$39 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 39 |  |
$40-$49 |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
NUMBER OF SHARES | shares | 1,978,575 |  |
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year | 2.54 |  |
WEIGHTED AVERAGE EXERCISE PRICE ($) | $ 46 |  |
$40-$49 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 40 |  |
$40-$49 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 49 |  |
$50-$59 |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
NUMBER OF SHARES | shares | 8,377,818 |  |
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year | 5.19 |  |
WEIGHTED AVERAGE EXERCISE PRICE ($) | $ 58 |  |
$50-$59 | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 50 |  |
$50-$59 | Top of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 59 |  |
$60 & above |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
NUMBER OF SHARES | shares | 98,448 |  |
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year | 5.84 |  |
WEIGHTED AVERAGE EXERCISE PRICE ($) | $ 61 |  |
$60 & above | Bottom of range |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 60 |  |

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