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Leases - Lease Assets by Segment (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Disclosure of operating segments [line items] |  |  |
Lease assets | $ 1,508 | $ 1,645 | $ 1,789
Operating segments | North America |  |  |
Disclosure of operating segments [line items] |  |  |
Lease assets | 308 | 345 |
Operating segments | North Sea |  |  |
Disclosure of operating segments [line items] |  |  |
Lease assets | 1 | 7 |
Operating segments | Offshore Africa |  |  |
Disclosure of operating segments [line items] |  |  |
Lease assets | 101 | 126 |
Operating segments | Oil Sands Mining and Upgrading |  |  |
Disclosure of operating segments [line items] |  |  |
Lease assets | 1,027 | 1,080 |
Head office |  |  |
Disclosure of operating segments [line items] |  |  |
Lease assets | $ 71 | $ 87 |

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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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