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Leases - Liability Continuity (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Leases [Abstract] |  |
Beginning balance | $ 692 | $ 672
Cash flows |  |
Principal payments | (139) | (163)
Interest on lease liabilities (Note 20(c)) | (35) | (37)
Non-cash changes |  |
Additions | 151 | 319
Interest expense (Note 9) | 35 | 37
Changes in foreign exchange and other | (10) | (136)
Ending balance | 694 | 692
Current portion of lease liabilities (Note 19(c)) | (127) | (119)
Lease liabilities (Note 19(c)) | $ 567 | $ 573

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- Definition The amount of current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of non-current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_17_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Additions, Lease Liability + References No definition available. + Details
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- Definition Cash Flows From Used In Increase Decrease In Lease Liability Continuity [Abstract] + References No definition available. + Details
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- Definition Change In Foreign Exchange And Other, Lease Liability + References No definition available. + Details
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- Definition Lease Liability, Accretion + References No definition available. + Details
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- Definition Leases [Abstract] + References No definition available. + Details
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- Definition Non Cash Transactions [abstract] + References No definition available. + Details
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