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Share-based payments - Stock Options Exercise Prices and Weighted Average Remaining Life (Details) | Dec. 31, 2020 year shares $ / shares | Dec. 31, 2019 shares year $ / shares | Dec. 31, 2018 shares $ / shares
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Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
NUMBER (in shares) | shares | 15,650,234 | 12,825,541 | 14,072,332
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year | 7 | 5 |
WEIGHTED AVERAGE EXERCISE PRICE ($) | $ 59 | $ 57 | $ 56
$40-$49 |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
NUMBER (in shares) | shares | 187,744 | 449,216 |
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year | 0 | 1 |
WEIGHTED AVERAGE EXERCISE PRICE ($) | $ 48 | $ 47 |
$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-$59 |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
NUMBER (in shares) | shares | 11,998,200 | 12,271,003 |
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year | 5 | 6 |
WEIGHTED AVERAGE EXERCISE PRICE ($) | $ 58 | $ 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 |  |
$60 & above |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
NUMBER (in shares) | shares | 3,464,290 | 105,322 |
WEIGHTED AVERAGE REMAINING LIFE (YEARS) | year | 9 | 4 |
WEIGHTED AVERAGE EXERCISE PRICE ($) | $ 65 | $ 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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