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Segmented Information - Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | $ 39,592 | $ 32,885
North America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 37,467 | 30,734
International |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 2,125 | 2,151
Elimination of intersegment amounts |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | (3,744) | (3,580)
Elimination of intersegment amounts | North America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | (3,744) | (3,580)
Oil Sands | Operating segments |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 15,743 | 13,274
Oil Sands | Operating segments | SCO And Diesel |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 11,659 | 11,244
Oil Sands | Operating segments | Bitumen |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 4,084 | 2,030
Oil Sands | Operating segments | North America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 15,743 | 13,274
Oil Sands | Operating segments | North America | SCO And Diesel |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 11,659 | 11,244
Oil Sands | Operating segments | North America | Bitumen |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 4,084 | 2,030
Exploration and Production | Operating segments |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 3,869 | 3,487
Exploration and Production | Operating segments | Crude Oil And Natural Gas Liquids |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 3,853 | 3,459
Exploration and Production | Operating segments | Natural Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 16 | 28
Exploration and Production | Operating segments | North America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 1,744 | 1,336
Exploration and Production | Operating segments | North America | Crude Oil And Natural Gas Liquids |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 1,741 | 1,326
Exploration and Production | Operating segments | North America | Natural Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 3 | 10
Exploration and Production | Operating segments | International |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 2,125 | 2,151
Exploration and Production | Operating segments | International | Crude Oil And Natural Gas Liquids |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 2,112 | 2,133
Exploration and Production | Operating segments | International | Natural Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 13 | 18
Refining and Marketing | Operating segments |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 23,724 | 19,704
Refining and Marketing | Operating segments | Gasoline |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 10,819 | 9,075
Refining and Marketing | Operating segments | Distillate |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 9,698 | 7,800
Refining and Marketing | Operating segments | Other Product and Services |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 3,207 | 2,829
Refining and Marketing | Operating segments | North America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 23,724 | 19,704
Refining and Marketing | Operating segments | North America | Gasoline |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 10,819 | 9,075
Refining and Marketing | Operating segments | North America | Distillate |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | 9,698 | 7,800
Refining and Marketing | Operating segments | North America | Other Product and Services |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Gross revenues | $ 3,207 | $ 2,829

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