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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Liquidity Risk (Details) $ in Millions, $ in Millions | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($)
--- | --- | --- | ---
Financial Liabilities |  |  |
Lease liabilities | $ 2,931 | $ 1,792 |
Derivative financial liabilities | 1,776 |  | $ 1,539
Derivative financial assets | 1,643 |  | 1,384
Derivative liabilities, net | 133 |  | 155
Accounts Payable |  |  |
Financial Liabilities |  |  |
Trade and other payables undiscounted cash flows | 6,501 |  | 5,576
Derivatives |  |  |
Financial Liabilities |  |  |
Gross derivative liability undiscounted cash flows | 1,776 |  | 1,539
Debt |  |  |
Financial Liabilities |  |  |
Debt undiscounted cash flows | 25,271 |  | 30,114
Lease Liablities |  |  |
Financial Liabilities |  |  |
Lease liabilities | 4,842 |  |
2020 | Accounts Payable |  |  |
Financial Liabilities |  |  |
Trade and other payables undiscounted cash flows | 6,422 |  | 5,492
2020 | Derivatives |  |  |
Financial Liabilities |  |  |
Gross derivative liability undiscounted cash flows | 1,568 |  | 1,539
2020 | Debt |  |  |
Financial Liabilities |  |  |
Debt undiscounted cash flows | 2,877 |  | 4,314
2020 | Lease Liablities |  |  |
Financial Liabilities |  |  |
Lease liabilities | 470 |  |
1 to 3 years | Accounts Payable |  |  |
Financial Liabilities |  |  |
Trade and other payables undiscounted cash flows | 39 |  | 42
1 to 3 years | Derivatives |  |  |
Financial Liabilities |  |  |
Gross derivative liability undiscounted cash flows | 208 |  |
1 to 3 years | Debt |  |  |
Financial Liabilities |  |  |
Debt undiscounted cash flows | 2,991 |  | 3,362
1 to 3 years | Lease Liablities |  |  |
Financial Liabilities |  |  |
Lease liabilities | 796 |  |
3 to 5 years | Accounts Payable |  |  |
Financial Liabilities |  |  |
Trade and other payables undiscounted cash flows | 40 |  | 42
3 to 5 years | Debt |  |  |
Financial Liabilities |  |  |
Debt undiscounted cash flows | 2,220 |  | 1,827
3 to 5 years | Lease Liablities |  |  |
Financial Liabilities |  |  |
Lease liabilities | 616 |  |
Thereafter | Debt |  |  |
Financial Liabilities |  |  |
Debt undiscounted cash flows | 17,183 |  | $ 20,611
Thereafter | Lease Liablities |  |  |
Financial Liabilities |  |  |
Lease liabilities | $ 2,960 |  |

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