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Related Party Transactions - Aggregate Compensation to Executive Team and Directors (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 CAD ($) individual | Dec. 31, 2020 CAD ($) individual
Executive team |  |
Disclosure of transactions between related parties [line items] |  |
Number of individuals | individual | 14 | 12
Base salary and annual incentive compensation | $ 22 | $ 18
Additional short-term benefits and other | 1 | 1
Share-based long-term incentive compensation | 36 | 23
Value of pension and post-retirement benefits | 6 | 2
Severance | $ 6 | $ 0
Directors |  |
Disclosure of transactions between related parties [line items] |  |
Number of individuals | individual | 13 | 10
Base salary and annual incentive compensation | $ 0 | $ 0
Additional short-term benefits and other | 1 | 1
Share-based long-term incentive compensation | 2 | 2
Value of pension and post-retirement benefits | 0 | 0
Severance | $ 0 | $ 0

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- Definition The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2021-01-01 -Paragraph 17 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_17_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2021-01-01 -Paragraph 17 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_17_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of compensation to key management personnel in the form of termination benefits. [Refer: Termination benefits expense; Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2021-01-01 -Paragraph 17 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_17_d&doctype=Standard -URIDate 2021-03-24 + Details
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