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Share Capital - Stock Option Activity (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares
Share Capital, Reserves And Other Equity Interest [Abstract] |  |
Stock options outstanding - beginning of year (in shares) | shares | 46,685 | 56,036
Stock options granted (in shares) | shares | 16,314 | 4,256
Stock options surrendered for cash settlement (in shares) | shares | (1,003) | (392)
Stock options exercised for common shares (in shares) | shares | (10,871) | (9,975)
Stock options forfeited (in shares) | shares | (3,479) | (3,240)
Stock options outstanding - end of year (in shares) | shares | 47,646 | 46,685
Stock options exercisable (in shares) | shares | 17,057 | 19,436
Weighted average exercise price, options outstanding - beginning of year (in CAD per share) | $ / shares | $ 37.92 | $ 36.67
Weighted average exercise price, options granted (in CAD per share) | $ / shares | 34.84 | 43.75
Weighted average exercise price, options surrendered for cash settlement (in CAD per share) | $ / shares | 34.52 | 33.46
Weighted average exercise price, options exercised (in CAD per share) | $ / shares | 33.16 | 33.28
Weighted average exercise price, options forfeited (in CAD per share) | $ / shares | 37.65 | 38.76
Weighted average exercise price, options outstanding - beginning of year (in CAD per share) | $ / shares | 38.04 | 37.92
Weighted average exercise price, options exercisable (in CAD per share) | $ / shares | $ 38.74 | $ 36.03

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- Definition Weighted Average Exercise Price Of Share Options Surrendered (decrease) For Cash In Share-based Payment Arrangement + References No definition available. + Details
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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_d&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of share options exercisable in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of share options forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_iii&doctype=Standard -URIDate 2019-03-27 + Details
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