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SEGMENTED INFORMATION - Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | $ 24,900 | $ 39,866
North America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 24,090 | 38,113
International |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 810 | 1,753
Elimination of intersegment amounts |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | (2,888) | (4,460)
Elimination of intersegment amounts | North America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | (2,888) | (4,460)
Oil Sands | Operating segments |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 10,617 | 18,347
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 | 8,574 | 13,567
Oil Sands | Operating segments | Bitumen |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 2,043 | 4,780
Oil Sands | Operating segments | North America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 10,617 | 18,347
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 | 8,574 | 13,567
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 | 2,043 | 4,780
Exploration and Production | Operating segments |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 1,899 | 3,675
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 | 1,895 | 3,669
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 | 4 | 6
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 | 1,089 | 1,922
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 | 1,089 | 1,922
Exploration and Production | Operating segments | International |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 810 | 1,753
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 | 806 | 1,747
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 | 4 | 6
Refining and Marketing | Operating segments |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 15,272 | 22,304
Refining and Marketing | Operating segments | Gasoline |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 6,585 | 9,941
Refining and Marketing | Operating segments | Distillate |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Total gross revenues from contracts with customers | 6,525 | 9,447
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 | 2,162 | 2,916
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 | 15,272 | 22,304
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 | 6,585 | 9,941
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 | 6,525 | 9,447
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 | $ 2,162 | $ 2,916

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