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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Fair Value Hierarchy (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Balance | $ (121) | $ (39)
Transfers of financial liabilities from level 1 to 2 | 0 |
Transfers of financial liabilities from level 2 to 1 | 0 |
Accounts receivable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial assets, at fair value | 153 | 94
Accounts Payable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial liabilities, at fair value | (274) | (133)
Level 1 |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Balance | (139) | (33)
Level 1 | Accounts receivable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial assets, at fair value | 63 | 33
Level 1 | Accounts Payable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial liabilities, at fair value | (202) | (66)
Level 2 |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Balance | 18 | (6)
Level 2 | Accounts receivable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial assets, at fair value | 90 | 61
Level 2 | Accounts Payable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial liabilities, at fair value | $ (72) | $ (67)

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