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Leases - Lease Assets by Segment (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019
--- | --- | ---
Disclosure of operating segments [line items] |  |
Lease assets | $ 1,789 | $ 1,539
Operating segments | North America |  |
Disclosure of operating segments [line items] |  |
Lease assets | 300 |
Operating segments | North Sea |  |
Disclosure of operating segments [line items] |  |
Lease assets | 38 |
Operating segments | Offshore Africa |  |
Disclosure of operating segments [line items] |  |
Lease assets | 154 |
Operating segments | Oil Sands Mining and Upgrading |  |
Disclosure of operating segments [line items] |  |
Lease assets | 1,191 |
Head office |  |
Disclosure of operating segments [line items] |  |
Lease assets | $ 106 |

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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 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
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