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Share Capital - Stock Option Activity (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2021 shares $ / shares | Dec. 31, 2020 shares $ / shares
Share Capital, Reserves And Other Equity Interest [Abstract] |  |
Stock options outstanding - beginning of year (in shares) | shares | 48,656 | 47,646
Stock options granted (in shares) | shares | 12,547 | 12,032
Stock options exercised for common shares (in shares) | shares | (18,147) | (3,979)
Stock options surrendered for cash settlement (in shares) | shares | (1,324) | (757)
Stock options forfeited (in shares) | shares | (3,405) | (6,286)
Stock options outstanding - end of year (in shares) | shares | 38,327 | 48,656
Stock options exercisable (in shares) | shares | 7,841 | 17,970
Weighted average exercise price, options outstanding - beginning of year (in CAD per share) | $ / shares | $ 37.53 | $ 38.04
Weighted average exercise price, options granted (in CAD per share) | $ / shares | 34.39 | 32.89
Weighted average exercise price, options exercised (in CAD per share) | $ / shares | 38.97 | 27.24
Weighted average exercise price, options surrendered for cash settlement (in CAD per share) | $ / shares | 40.54 | 29.34
Weighted average exercise price, options forfeited (in CAD per share) | $ / shares | 35.73 | 39.65
Weighted average exercise price, options outstanding - beginning of year (in CAD per share) | $ / shares | 35.88 | 37.53
Weighted average exercise price, options exercisable (in CAD per share) | $ / shares | $ 39.19 | $ 39.59

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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 2021-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_d&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_iii&doctype=Standard -URIDate 2021-03-24 + Details
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