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OTHER TRANSACTIONS (Details) $ in Millions, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 28, 2019 CAD ($) | Sep. 29, 2018 CAD ($) | Sep. 30, 2019 CAD ($) | Mar. 31, 2019 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | May 31, 2018 USD ($) | May 31, 2018 CAD ($)
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |  |
Proceeds from disposal of assets |  |  |  |  | $ 274.0 | $ 84.0 |  |
Gain on sale of business |  |  |  |  | 253.0 | 24.0 |  |
Exploration and Production |  |  |  |  |  |  |  |
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |  |
Gain on sale of business |  |  |  |  | $ 228.0 | $ (91.0) |  |
Non Core Australian Assets |  |  |  |  |  |  |  |
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |  |
Gain on sale of business |  |  | $ 65.0 |  |  |  |  |
Gain on sale of business after tax |  |  | $ 48.0 |  |  |  |  |
Suncor's Libyan Assets |  |  |  |  |  |  |  |
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |  |
Gain on sale of business |  |  |  | $ 363.0 |  |  |  |
Gain on sale of business after tax |  |  |  | $ (264.0) |  |  |  |
Fenja Development Project |  |  |  |  |  |  |  |
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |  |
Interest purchased (as a percent) |  |  |  |  |  |  | 17.50% | 17.50%
Consideration paid |  |  |  |  |  |  | $ 55 | $ 70.0
Interim settlement costs |  |  |  |  |  |  |  | $ 22.0
Canbriam Energy, Inc. |  |  |  |  |  |  |  |
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |  |
Ownership interest (as percent) | 37.00% |  |  |  |  |  |  |
Canbriam Energy, Inc. | Exploration and Production |  |  |  |  |  |  |  |
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |  |
Gain on sale of business | $ 151.0 |  |  |  |  |  |  |
Gain on sale of business after tax | 139.0 |  |  |  |  |  |  |
Consideration paid | $ 52.0 |  |  |  |  |  |  |
Joslyn Oil Sands Mining Project |  |  |  |  |  |  |  |
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |  |
Percentage of working interest agreed to sell |  | 36.75% |  |  |  |  |  |
Gross proceeds |  | $ 82.7 |  |  |  |  |  |
Proceeds from disposal of assets |  | 36.8 |  |  |  |  |  |
Total receivable |  | 45.9 |  |  |  |  |  |
Long term receivable |  | 36.7 |  |  |  |  |  |
Current receivable |  | $ 9.2 |  |  |  |  |  |
Other receivable term |  | 5 years |  |  |  |  |  |
Gain on sale of business |  | $ 83.0 |  |  |  |  |  |
Suncor With the Other Working Interest Partners | Joslyn Oil Sands Mining Project |  |  |  |  |  |  |  |
Disclosure of Other Transactions [Line Items] |  |  |  |  |  |  |  |
Percentage of working interest agreed to sell |  | 100.00% |  |  |  |  |  |
Gross proceeds |  | $ 225.0 |  |  |  |  |  |
Proceeds from disposal of assets |  | 100.0 |  |  |  |  |  |
Total receivable |  | $ 125.0 |  |  |  |  |  |

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