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Joint Arrangements - Joint Operations (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fort Hills Energy Limited Partnership
Disclosure of joint operations
Ownership interest (as percent)	54.11%	53.06%
Syncrude
Disclosure of joint operations
Ownership interest (as percent)	58.74%	53.74%
Terra Nova
Disclosure of joint operations
Ownership interest (as percent)	37.68%	37.68%
Buzzard
Disclosure of joint operations
Ownership interest (as percent)	29.89%	29.89%
Fenja Development JV
Disclosure of joint operations
Ownership interest (as percent)	17.50%
Golden Eagle Area Development
Disclosure of joint operations
Ownership interest (as percent)	26.69%	26.69%
Hibernia and the Hibernia South Extension Unit | Minimum
Disclosure of joint operations
Ownership interest (as percent)	19.19%	19.19%
Hibernia and the Hibernia South Extension Unit | Maximum
Disclosure of joint operations
Ownership interest (as percent)	20.00%	20.00%
Hebron
Disclosure of joint operations
Ownership interest (as percent)	21.03%	21.03%
Harouge Oil Operations
Disclosure of joint operations
Ownership interest (as percent)	49.00%	49.00%
North Sea Rosebank Project
Disclosure of joint operations
Ownership interest (as percent)	40.00%	30.00%
Oda
Disclosure of joint operations
Ownership interest (as percent)	30.00%	30.00%
White Rose and the White Rose Extensions | Minimum
Disclosure of joint operations
Ownership interest (as percent)	26.13%	26.13%
White Rose and the White Rose Extensions | Maximum
Disclosure of joint operations
Ownership interest (as percent)	27.50%	27.50%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2018-01-01
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-Subparagraph a
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-URIDate 2018-03-16

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