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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Fair Value of Derivatives (Details) - CAD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | $ (266) | $ (1,069)
Foreign exchange contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | (85) | (299)
Interest rate contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | (95) | (610)
Commodity contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | (90) | (156)
Other contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | 4 | (4)
Recurring basis |  |
Fair Value of Derivatives |  |
Current derivative assets | 402 | 323
Long-term derivative assets | 761 | 561
Current derivative liabilities | (714) | (894)
Long-term derivative liabilities | (715) | (1,059)
Total net derivative asset/(liability) | (266) | (1,069)
Recurring basis | Foreign exchange contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 242 | 180
Long-term derivative assets | 465 | 466
Current derivative liabilities | (249) | (185)
Long-term derivative liabilities | (543) | (760)
Total net derivative asset/(liability) | (85) | (299)
Recurring basis | Interest rate contracts |  |
Fair Value of Derivatives |  |
Long-term derivative assets | 247 | 56
Current derivative liabilities | (240) | (425)
Long-term derivative liabilities | (102) | (241)
Total net derivative asset/(liability) | (95) | (610)
Recurring basis | Commodity contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 158 | 143
Long-term derivative assets | 47 | 39
Current derivative liabilities | (225) | (280)
Long-term derivative liabilities | (70) | (58)
Total net derivative asset/(liability) | (90) | (156)
Recurring basis | Other contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 2 |
Long-term derivative assets | 2 |
Current derivative liabilities |  | (4)
Total net derivative asset/(liability) | 4 | (4)
Level 1 | Recurring basis |  |
Fair Value of Derivatives |  |
Current derivative assets | 55 | 43
Long-term derivative assets | 8 | 1
Current derivative liabilities | (55) | (39)
Long-term derivative liabilities | (11) | (1)
Total net derivative asset/(liability) | (3) | 4
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 |  |
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 | Commodity contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 55 | 43
Long-term derivative assets | 8 | 1
Current derivative liabilities | (55) | (39)
Long-term derivative liabilities | (11) | (1)
Total net derivative asset/(liability) | (3) | 4
Level 1 | Recurring basis | Other contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 0 |
Long-term derivative assets | 0 |
Current derivative liabilities |  | 0
Total net derivative asset/(liability) | 0 | 0
Level 2 | Recurring basis |  |
Fair Value of Derivatives |  |
Current derivative assets | 281 | 213
Long-term derivative assets | 741 | 546
Current derivative liabilities | (514) | (632)
Long-term derivative liabilities | (652) | (1,009)
Total net derivative asset/(liability) | (144) | (882)
Level 2 | Recurring basis | Foreign exchange contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 242 | 180
Long-term derivative assets | 465 | 466
Current derivative liabilities | (249) | (185)
Long-term derivative liabilities | (543) | (760)
Total net derivative asset/(liability) | (85) | (299)
Level 2 | Recurring basis | Interest rate contracts |  |
Fair Value of Derivatives |  |
Long-term derivative assets | 247 | 56
Current derivative liabilities | (240) | (425)
Long-term derivative liabilities | (102) | (241)
Total net derivative asset/(liability) | (95) | (610)
Level 2 | Recurring basis | Commodity contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 37 | 33
Long-term derivative assets | 27 | 24
Current derivative liabilities | (25) | (18)
Long-term derivative liabilities | (7) | (8)
Total net derivative asset/(liability) | 32 | 31
Level 2 | Recurring basis | Other contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 2 |
Long-term derivative assets | 2 |
Current derivative liabilities |  | (4)
Total net derivative asset/(liability) | 4 | (4)
Level 3 | Recurring basis |  |
Fair Value of Derivatives |  |
Current derivative assets | 66 | 67
Long-term derivative assets | 12 | 14
Current derivative liabilities | (145) | (223)
Long-term derivative liabilities | (52) | (49)
Total net derivative asset/(liability) | (119) | (191)
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 |  |
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 | Commodity contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 66 | 67
Long-term derivative assets | 12 | 14
Current derivative liabilities | (145) | (223)
Long-term derivative liabilities | (52) | (49)
Total net derivative asset/(liability) | (119) | (191)
Level 3 | Recurring basis | Other contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 0 |
Long-term derivative assets | 0 |
Current derivative liabilities |  | 0
Total net derivative asset/(liability) | $ 0 | $ 0

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