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Acquisition Of Additional Ownership Interest In Syncrude (Details) - Syncrude $ in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 23, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Feb. 23, 2018 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |
Percentage of additional working interest acquired | 5.00% |  |
Cash transferred | $ 923 |  |
Interest purchased (as a percent) | 58.74% |  | 58.74%
Assets acquired |  |  |
Accounts receivable |  |  | $ 2
Inventory |  |  | 15
Property, plant and equipment |  |  | 998
Exploration and evaluation |  |  | 163
Total assets acquired |  |  | 1,178
Liabilities assumed |  |  |
Accounts payable and other liabilities |  |  | (51)
Employee future benefits |  |  | (33)
Decommissioning provision |  |  | (169)
Deferred income taxes |  |  | (2)
Total liabilities assumed |  |  | (255)
Net assets acquired |  |  | $ 923
Contribution to gross revenues |  | $ 270 |
Contribution to consolidated net income |  | 7 |
Proforma revenue contributed by acquired entity if acquisition had occurred at the beginning of year |  | 64 |
Proforma net loss contributed by acquired entity if acquisition had occurred at the beginning of year |  | (4) |
Proforma gross revenues |  | 39,660 |
Proforma net income |  | $ 3,300 |

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