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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Financial Liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives |  |
Financial Liabilities Offsetting |  |
Gross Liabilities | $ (1,776) | $ (1,539)
Gross Assets Offset | 1,643 | 1,384
Net Amounts Presented | (133) | (155)
Accounts Payable |  |
Financial Liabilities Offsetting |  |
Gross Liabilities | (2,532) | (1,798)
Gross Assets Offset | 1,289 | 882
Net Amounts Presented | (1,243) | (916)
Financial liabilities |  |
Financial Liabilities Offsetting |  |
Gross Liabilities | (4,308) | (3,337)
Gross Assets Offset | 2,932 | 2,266
Net Amounts Presented | $ (1,376) | $ (1,071)

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