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Leases - Additional Information (Details) $ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 CAD ($) | Dec. 31, 2018 renewalOption | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Right-of-use assets | $ 704 |  |  | $ 730 | $ 762
Lease liabilities | 694 |  |  | 692 | $ 672
TAK | Subsidiaries |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Lease liabilities | $ 87 |  |  | 99 |
TAK | Next 18 years, after year 1 | Subsidiaries |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Lease liabilities |  |  | $ 6 |  |
Fort Hills Energy Limited Partnership |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Lease term |  | 25 years |  |  |
Number of renewal options | renewalOption |  | 4 |  |  |
Renewal term | 5 years |  |  |  |
Fort Hills Energy Limited Partnership | Joint operations |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Lease liabilities | $ 195 |  |  | $ 199 |

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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 assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_j&doctype=Standard -URIDate 2021-03-24 + Details
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