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Acquisition Of Additional Ownership Interest In Syncrude (Details) - Syncrude - CAD CAD in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 23, 2016 | Dec. 31, 2016 | Dec. 31, 2016
Disclosure of detailed information about business combination [line items] |  |  |
Percentage of additional working interest acquired | 5.00% |  |
Share in joint operation | 53.74% |  |
Assets acquired |  |  |
Accounts receivable | CAD 8.0 |  |
Inventory | 19.0 |  |
Property, plant and equipment | 1,330.0 |  |
Exploration and evaluation | 82.0 |  |
Total assets acquired | 1,439.0 |  |
Liabilities assumed |  |  |
Accounts payable and other liabilities | (29.0) |  |
Employee future benefits | (49.0) |  |
Decommissioning provision | (187.0) |  |
Deferred income taxes | (228.0) |  |
Total liabilities assumed | (493.0) |  |
Net assets acquired | CAD 946.0 |  |
Contribution to gross revenues |  | CAD 191.0 |
Contribution to consolidated net income |  | CAD 7.0 |
Proforma revenue contributed by acquired entity if acquisition had occurred at the beginning of year |  |  | CAD 275.0
Proforma net loss contributed by acquired entity if acquisition had occurred at the beginning of year |  |  | 26.0
Proforma gross revenues |  |  | 27,000.0
Proforma net income |  |  | CAD 412.0

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