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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - FAIR VALUE OF DERIVATIVES (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value of Derivatives |  |
Short-term portion of derivative assets | $ 327 | $ 498
Current derivative liabilities | (920) | (1,234)
Total net derivative asset/(liability) | (1,687) | (3,210)
Forward currency contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | (1,102) | (2,718)
Interest rate contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | (534) | (515)
Commodity contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | (58) | 30
Other contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | 7 | (7)
Fair Value |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 328 | 498
Long-term derivative assets | 101 | 119
Current derivative liabilities | (936) | (1,234)
Long-term derivative liabilities | (1,180) | (2,593)
Total net derivative asset/(liability) | (1,687) | (3,210)
Fair Value | Forward currency contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 161 | 47
Long-term derivative assets | 81 | 62
Current derivative liabilities | (410) | (615)
Long-term derivative liabilities | (934) | (2,212)
Total net derivative asset/(liability) | (1,102) | (2,718)
Fair Value | Interest rate contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets |  | 22
Long-term derivative assets |  | 5
Current derivative liabilities | (353) | (341)
Long-term derivative liabilities | (181) | (201)
Total net derivative asset/(liability) | (534) | (515)
Fair Value | Commodity contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 163 | 429
Long-term derivative assets | 17 | 52
Current derivative liabilities | (173) | (273)
Long-term derivative liabilities | (65) | (178)
Total net derivative asset/(liability) | (58) | 30
Fair Value | Other contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 4 |
Long-term derivative assets | 3 |
Current derivative liabilities | 0 | (5)
Long-term derivative liabilities | 0 | (2)
Total net derivative asset/(liability) |  | (7)
Level 1 | Fair Value |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 0 | 24
Long-term derivative assets | 0 | 0
Current derivative liabilities | (5) | (7)
Long-term derivative liabilities | 0 | 0
Total net derivative asset/(liability) | (5) | 17
Level 1 | Fair Value | Forward currency contracts |  |
Fair Value of Derivatives |  |
Short-term portion of 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 | Fair Value | Interest rate contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets |  | 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 | Fair Value | Commodity contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 0 | 24
Long-term derivative assets | 0 | 0
Current derivative liabilities | (5) | (7)
Long-term derivative liabilities | 0 | 0
Total net derivative asset/(liability) | (5) | 17
Level 1 | Fair Value | Other contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 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 2 | Fair Value |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 198 | 114
Long-term derivative assets | 96 | 97
Current derivative liabilities | (786) | (989)
Long-term derivative liabilities | (1,121) | (2,438)
Total net derivative asset/(liability) | (1,613) | (3,216)
Level 2 | Fair Value | Forward currency contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 161 | 47
Long-term derivative assets | 81 | 62
Current derivative liabilities | (410) | (615)
Long-term derivative liabilities | (934) | (2,212)
Total net derivative asset/(liability) | (1,102) | (2,718)
Level 2 | Fair Value | Interest rate contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets |  | 22
Long-term derivative assets |  | 5
Current derivative liabilities | (353) | (341)
Long-term derivative liabilities | (181) | (201)
Total net derivative asset/(liability) | (534) | (515)
Level 2 | Fair Value | Commodity contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 33 | 45
Long-term derivative assets | 12 | 30
Current derivative liabilities | (23) | (28)
Long-term derivative liabilities | (6) | (23)
Total net derivative asset/(liability) | 16 | 24
Level 2 | Fair Value | Other contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 4 |
Long-term derivative assets | 3 |
Current derivative liabilities | 0 | (5)
Long-term derivative liabilities | 0 | (2)
Total net derivative asset/(liability) | 7 | (7)
Level 3 | Fair Value |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 130 | 360
Long-term derivative assets | 5 | 22
Current derivative liabilities | (145) | (238)
Long-term derivative liabilities | (59) | (155)
Total net derivative asset/(liability) | (69) | (11)
Level 3 | Fair Value | Forward currency contracts |  |
Fair Value of Derivatives |  |
Short-term portion of 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 | Fair Value | Interest rate contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets |  | 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 | Fair Value | Commodity contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 130 | 360
Long-term derivative assets | 5 | 22
Current derivative liabilities | (145) | (238)
Long-term derivative liabilities | (59) | (155)
Total net derivative asset/(liability) | (69) | (11)
Level 3 | Fair Value | Other contracts |  |
Fair Value of Derivatives |  |
Short-term portion of derivative assets | 0 |
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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