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SEGMENTED INFORMATION - Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | $ 39,866 | $ 39,592
North America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 38,113 | 37,467
International |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 1,753 | 2,125
Elimination of intersegment amounts |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | (4,460) | (3,798)
Elimination of intersegment amounts | North America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | (4,460) | (3,798)
Oil Sands | Operating segments |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 18,347 | 15,743
Oil Sands | Operating segments | SCO And Diesel |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 13,368 | 11,659
Oil Sands | Operating segments | Bitumen |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 4,979 | 4,084
Oil Sands | Operating segments | North America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 18,347 | 15,743
Oil Sands | Operating segments | North America | SCO And Diesel |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 13,368 | 11,659
Oil Sands | Operating segments | North America | Bitumen |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 4,979 | 4,084
Exploration and Production | Operating segments |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 3,675 | 3,869
Exploration and Production | Operating segments | Crude Oil And Natural Gas Liquids |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 3,669 | 3,853
Exploration and Production | Operating segments | Natural Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 6 | 16
Exploration and Production | Operating segments | North America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 1,922 | 1,744
Exploration and Production | Operating segments | North America | Crude Oil And Natural Gas Liquids |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 1,922 | 1,741
Exploration and Production | Operating segments | North America | Natural Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers |  | 3
Exploration and Production | Operating segments | International |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 1,753 | 2,125
Exploration and Production | Operating segments | International | Crude Oil And Natural Gas Liquids |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 1,747 | 2,112
Exploration and Production | Operating segments | International | Natural Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 6 | 13
Refining and Marketing | Operating segments |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 22,304 | 23,778
Refining and Marketing | Operating segments | Gasoline |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 9,941 | 10,819
Refining and Marketing | Operating segments | Distillate |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 9,447 | 9,698
Refining and Marketing | Operating segments | Other Product and Services |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 2,916 | 3,261
Refining and Marketing | Operating segments | North America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 22,304 | 23,778
Refining and Marketing | Operating segments | North America | Gasoline |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 9,941 | 10,819
Refining and Marketing | Operating segments | North America | Distillate |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 9,447 | 9,698
Refining and Marketing | Operating segments | North America | Other Product and Services |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | $ 2,916 | $ 3,261

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