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Leases - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Leases Disclosure [Line Items] |  |
Cash outflow in relation to lease obligation | $ 9 | $ 9
Real Estate [member] | Bottom Of Range [Member] |  |
Leases Disclosure [Line Items] |  |
Terms of operating lease commitments | 1 year |
Real Estate [member] | Top of Range [Member] |  |
Leases Disclosure [Line Items] |  |
Terms of operating lease commitments | 10 years |
Vehicles [member] | Bottom Of Range [Member] |  |
Leases Disclosure [Line Items] |  |
Terms of operating lease commitments | 3 years |
Vehicles [member] | Top of Range [Member] |  |
Leases Disclosure [Line Items] |  |
Terms of operating lease commitments | 4 years |
Rig Equipment [Member] |  |
Leases Disclosure [Line Items] |  |
Long-term drilling contracts | $ 503 | $ 477
Rig Equipment [Member] | Bottom Of Range [Member] |  |
Leases Disclosure [Line Items] |  |
Term of operating leases under long term drilling contracts | 1 year |
Rig Equipment [Member] | Top of Range [Member] |  |
Leases Disclosure [Line Items] |  |
Term of operating leases under long term drilling contracts | 5 years |

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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_g&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of income relating to variable lease payments for operating leases that do not depend on an index or a rate. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 90 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_90_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Leases disclosure. + References No definition available. + Details
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- Definition Term of operating lease commitments. + References No definition available. + Details
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- Definition Term of operating leases under long term drilling contracts. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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