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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Fair Value of Derivatives (Details) - CAD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | $ (2,582) | $ (3,210)
Foreign exchange contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | (1,696) | (2,718)
Interest rate contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | (796) | (515)
Commodity contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | (90) | 30
Other contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | 0 | (7)
Recurring basis |  |
Fair Value of Derivatives |  |
Current derivative assets | 235 | 498
Long-term derivative assets | 139 | 119
Current derivative liabilities | (894) | (1,234)
Long-term derivative liabilities | (2,062) | (2,593)
Total net derivative asset/(liability) | (2,582) | (3,210)
Recurring basis | Foreign exchange contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 37 | 47
Long-term derivative assets | 113 | 62
Current derivative liabilities | (452) | (615)
Long-term derivative liabilities | (1,394) | (2,212)
Total net derivative asset/(liability) | (1,696) | (2,718)
Recurring basis | Interest rate contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 2 | 22
Long-term derivative assets |  | 5
Current derivative liabilities | (258) | (341)
Long-term derivative liabilities | (540) | (201)
Total net derivative asset/(liability) | (796) | (515)
Recurring basis | Commodity contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 196 | 429
Long-term derivative assets | 24 | 52
Current derivative liabilities | (184) | (273)
Long-term derivative liabilities | (126) | (178)
Total net derivative asset/(liability) | (90) | 30
Recurring basis | Other contracts |  |
Fair Value of Derivatives |  |
Long-term derivative assets | 2 |
Current derivative liabilities | 0 | (5)
Long-term derivative liabilities | (2) | (2)
Total net derivative asset/(liability) | 0 | (7)
Level 1 | Recurring basis |  |
Fair Value of Derivatives |  |
Current derivative assets | 6 | 24
Long-term derivative assets | 0 | 0
Current derivative liabilities | (10) | (7)
Long-term derivative liabilities | 0 | 0
Total net derivative asset/(liability) | (4) | 17
Level 1 | Recurring basis | Foreign exchange contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 0 | 0
Long-term derivative assets | 0 | 0
Current derivative liabilities | 0 | 0
Long-term derivative liabilities | 0 | 0
Total net derivative asset/(liability) | 0 | 0
Level 1 | Recurring basis | Interest rate contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 0 | 0
Long-term derivative assets |  | 0
Current derivative liabilities | 0 | 0
Long-term derivative liabilities | 0 | 0
Total net derivative asset/(liability) | 0 | 0
Level 1 | Recurring basis | Commodity contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 6 | 24
Long-term derivative assets | 0 | 0
Current derivative liabilities | (10) | (7)
Long-term derivative liabilities | 0 | 0
Total net derivative asset/(liability) | (4) | 17
Level 1 | Recurring basis | Other contracts |  |
Fair Value of Derivatives |  |
Long-term derivative assets | 0 |
Current derivative liabilities | 0 | 0
Long-term derivative liabilities | 0 | 0
Total net derivative asset/(liability) | 0 | 0
Level 2 | Recurring basis |  |
Fair Value of Derivatives |  |
Current derivative assets | 66 | 114
Long-term derivative assets | 129 | 97
Current derivative liabilities | (726) | (989)
Long-term derivative liabilities | (1,945) | (2,438)
Total net derivative asset/(liability) | (2,476) | (3,216)
Level 2 | Recurring basis | Foreign exchange contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 37 | 47
Long-term derivative assets | 113 | 62
Current derivative liabilities | (452) | (615)
Long-term derivative liabilities | (1,394) | (2,212)
Total net derivative asset/(liability) | (1,696) | (2,718)
Level 2 | Recurring basis | Interest rate contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 2 | 22
Long-term derivative assets |  | 5
Current derivative liabilities | (258) | (341)
Long-term derivative liabilities | (540) | (201)
Total net derivative asset/(liability) | (796) | (515)
Level 2 | Recurring basis | Commodity contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 27 | 45
Long-term derivative assets | 14 | 30
Current derivative liabilities | (16) | (28)
Long-term derivative liabilities | (9) | (23)
Total net derivative asset/(liability) | 16 | 24
Level 2 | Recurring basis | Other contracts |  |
Fair Value of Derivatives |  |
Long-term derivative assets | 2 |
Current derivative liabilities | 0 | (5)
Long-term derivative liabilities | (2) | (2)
Total net derivative asset/(liability) | 0 | (7)
Level 3 | Recurring basis |  |
Fair Value of Derivatives |  |
Current derivative assets | 163 | 360
Long-term derivative assets | 10 | 22
Current derivative liabilities | (158) | (238)
Long-term derivative liabilities | (117) | (155)
Total net derivative asset/(liability) | (102) | (11)
Level 3 | Recurring basis | Foreign exchange contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 0 | 0
Long-term derivative assets | 0 | 0
Current derivative liabilities | 0 | 0
Long-term derivative liabilities | 0 | 0
Total net derivative asset/(liability) | 0 | 0
Level 3 | Recurring basis | Interest rate contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 0 | 0
Long-term derivative assets |  | 0
Current derivative liabilities | 0 | 0
Long-term derivative liabilities | 0 | 0
Total net derivative asset/(liability) | 0 | 0
Level 3 | Recurring basis | Commodity contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 163 | 360
Long-term derivative assets | 10 | 22
Current derivative liabilities | (158) | (238)
Long-term derivative liabilities | (117) | (155)
Total net derivative asset/(liability) | (102) | (11)
Level 3 | Recurring basis | Other contracts |  |
Fair Value of Derivatives |  |
Long-term derivative assets | 0 |
Current derivative liabilities | 0 | 0
Long-term derivative liabilities | 0 | 0
Total net derivative asset/(liability) | $ 0 | $ 0

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