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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Fair Value Hierarchy (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Balance | $ (39) | $ 60
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 | 94 | 215
Accounts Payable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial liabilities, at fair value | (133) | (155)
Level 1 |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Balance | (33) | 20
Level 1 | Accounts receivable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial assets, at fair value | 33 | 63
Level 1 | Accounts Payable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial liabilities, at fair value | (66) | (43)
Level 2 |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Balance | (6) | 40
Level 2 | Accounts receivable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial assets, at fair value | 61 | 152
Level 2 | Accounts Payable |  |
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value |  |
Financial liabilities, at fair value | $ (67) | $ (112)

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