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INCOME TAXES - Deferred Income (Details) - CAD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 28, 2019 | May 27, 2019 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Line Items] |  |  |  |  |
Impact of income tax rate and legislative changes | $ 1,116 |  |  | $ 1,067 |
Applicable tax rate |  | 12.00% |  | 26.74% | 27.04%
Corporate and Eliminations segment |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Impact of income tax rate and legislative changes |  |  | $ 48 |  |
Oil Sands | Operating segments |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Impact of income tax rate and legislative changes |  |  | 910 |  |
Refining and Marketing | Operating segments |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Impact of income tax rate and legislative changes |  |  | 88 |  |
Exploration and Production | Operating segments |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Impact of income tax rate and legislative changes |  |  | $ 70 |  |
2019 |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Applicable tax rate | 11.00% |  |  |  |
2020 |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Applicable tax rate | 10.00% |  |  |  |
2021 |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Applicable tax rate | 9.00% |  |  |  |
2022 |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Applicable tax rate | 8.00% |  |  |  |

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