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Leases - Lease Assets (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 CAD ($)
Disclosure Of Information About Lease Assets Explanatory [Line Items]
Additions	$ 527
Depreciation	(259)
Derecognitions	(6)
Foreign exchange adjustments and other	(12)
Lease assets, ending balance	1,789
Product transportation and storage
Disclosure Of Information About Lease Assets Explanatory [Line Items]
Additions	452
Depreciation	(106)
Derecognitions	0
Foreign exchange adjustments and other	(3)
Lease assets, ending balance	1,166
Field equipment and power
Disclosure Of Information About Lease Assets Explanatory [Line Items]
Additions	43
Depreciation	(54)
Derecognitions	(6)
Foreign exchange adjustments and other	2
Lease assets, ending balance	317
Offshore vessels and equipment
Disclosure Of Information About Lease Assets Explanatory [Line Items]
Additions	12
Depreciation	(72)
Derecognitions	0
Foreign exchange adjustments and other	(10)
Lease assets, ending balance	182
Office leases and other
Disclosure Of Information About Lease Assets Explanatory [Line Items]
Additions	20
Depreciation	(27)
Derecognitions	0
Foreign exchange adjustments and other	(1)
Lease assets, ending balance	$ 124

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[Line Items] for Disclosure Of Information About Lease Assets Explanatory [Table]

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Disposals Of Right-Of-Use Assets

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Foreign Exchange Adjustments And Other, Right-Of-Use Assets

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The amount of additions to right-of-use assets. [Refer: Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 53
-Subparagraph h
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_h&doctype=Standard
-URIDate 2019-03-27

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- Definition

The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 53
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_a&doctype=Standard
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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
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-Number 16
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-Paragraph 53
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