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Joint Arrangements - Joint Operations (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Fort Hills Energy Limited Partnership |  |
Disclosure of joint operations |  |
Ownership interest (as percent) | 53.06% | 50.80%
Syncrude |  |
Disclosure of joint operations |  |
Ownership interest (as percent) | 53.74% | 53.74%
Terra Nova |  |
Disclosure of joint operations |  |
Ownership interest (as percent) | 37.68% | 37.68%
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%
Hibernia and the Hibernia South Extension Unit | Minimum |  |
Disclosure of joint operations |  |
Ownership interest (as percent) | 19.19% | 19.13%
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%
Buzzard |  |
Disclosure of joint operations |  |
Ownership interest (as percent) | 29.89% | 29.89%
Golden Eagle Area Development |  |
Disclosure of joint operations |  |
Ownership interest (as percent) | 26.69% | 26.69%
North Sea Rosebank Project |  |
Disclosure of joint operations |  |
Ownership interest (as percent) | 30.00% | 30.00%
Oda |  |
Disclosure of joint operations |  |
Ownership interest (as percent) | 30.00% | 30.00%

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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 2017-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_21_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
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