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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Liquidity Risk (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial Liabilities |  |
Lease liabilities | $ 2,908 | $ 2,931
Derivative financial liabilities | 3,011 | 1,776
Derivative financial assets | 2,737 | 1,643
Derivative liabilities, net | 274 | 133
Accounts Payable |  |
Financial Liabilities |  |
Trade and other payables undiscounted cash flows | 4,484 | 6,501
Derivatives |  |
Financial Liabilities |  |
Gross derivative liability undiscounted cash flows | 3,011 | 1,776
Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 28,849 | 25,271
Lease Liabilities |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 4,655 | 4,842
2021 | Accounts Payable |  |
Financial Liabilities |  |
Trade and other payables undiscounted cash flows | 4,410 | 6,422
2021 | Derivatives |  |
Financial Liabilities |  |
Gross derivative liability undiscounted cash flows | 2,849 | 1,568
2021 | Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 5,773 | 2,877
2021 | Lease Liabilities |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 474 | 470
2023 | Accounts Payable |  |
Financial Liabilities |  |
Trade and other payables undiscounted cash flows | 37 | 39
2023 | Derivatives |  |
Financial Liabilities |  |
Gross derivative liability undiscounted cash flows | 162 | 208
2023 | Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 2,233 | 2,991
2023 | Lease Liabilities |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 771 | 796
2025 | Accounts Payable |  |
Financial Liabilities |  |
Trade and other payables undiscounted cash flows | 37 | 40
2025 | Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 3,009 | 2,220
2025 | Lease Liabilities |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 631 | 616
Thereafter | Debt |  |
Financial Liabilities |  |
Debt undiscounted cash flows | 17,834 | 17,183
Thereafter | Lease Liabilities |  |
Financial Liabilities |  |
Debt undiscounted cash flows | $ 2,779 | $ 2,960

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