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Share-based payments - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of shares authorized (in shares) | 4,360,087 |
ESP |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Award vesting period | 2 years |
RSUs/PSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Award vesting period | 3 years |
DSP |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Liabilities from share-based payment transactions | $ 19 | $ 22
Stock Options |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Award vesting period | 3 years |
Number of shares authorized (in shares) | 4,193,370 |
Top of range | ESP |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Maximum employee contribution rate | 12.00% |
Maximum employer contribution rate | 2.00% |
Top of range | Stock Options |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Award exercise period | 10 years |
Bottom of range | DSU |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Percent of employee compensation paid in DSUs after minimum share ownership requirement | 50.00% |
Bottom of range | Stock Options |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Award exercise period | 7 years |

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- Definition Share-Based Compensation Arrangement By Share-Based Payment Award, Maximum Employee Subscription Rate1 + References No definition available. + Details
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- Definition Share-Based Payment Arrangement, Percent of Employee Compensation Paid in Other Equity Instruments After Minimum Share Ownership Requirement + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 51 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_51_b_i&doctype=Standard -URIDate 2020-01-01 + Details
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