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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Liquidity Risk (Details) $ in Millions, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Mar. 05, 2021 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
Financial Liabilities |  |  |  |  |
Cash and cash equivalents | $ 2,205 |  |  | $ 1,885 | $ 1,960
Total credit facilities | 6,951 |  |  |  |
Total unutilized credit facilities | 4,520 |  |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |  |
Trade and other payables undiscounted cash flows | 6,356 |  |  | 4,484 |
Gross derivative liability undiscounted cash flows | 6,625 |  |  | 3,011 |
Debt undiscounted cash flows | 26,231 |  |  | 28,849 |
Lease liabilities | 4,531 |  |  | 4,655 |
Bilateral credit facilities |  |  |  |  |
Financial Liabilities |  |  |  |  |
Credit facilities terminated |  |  | $ 2,800 |  |
Within one year |  |  |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |  |
Trade and other payables undiscounted cash flows | 6,282 |  |  | 4,410 |
Gross derivative liability undiscounted cash flows | 6,466 |  |  | 2,849 |
Debt undiscounted cash flows | 2,253 |  |  | 5,773 |
Lease liabilities | 459 |  |  | 474 |
2 to 3 years |  |  |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |  |
Trade and other payables undiscounted cash flows | 37 |  |  | 37 |
Gross derivative liability undiscounted cash flows | 159 |  |  | 162 |
Debt undiscounted cash flows | 2,015 |  |  | 2,233 |
Lease liabilities | 779 |  |  | 771 |
4 to 5 years |  |  |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |  |
Trade and other payables undiscounted cash flows | 37 |  |  | 37 |
Debt undiscounted cash flows | 3,127 |  |  | 3,009 |
Lease liabilities | 660 |  |  | 631 |
Over 5 years |  |  |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |  |
Debt undiscounted cash flows | 18,836 |  |  | 17,834 |
Lease liabilities | 2,633 |  |  | 2,779 |
Liquidity Risk |  |  |  |  |
Financial Liabilities |  |  |  |  |
Cash and cash equivalents | 2,200 |  |  |  |
Total credit facilities | 7,000 |  |  |  |
Total unutilized credit facilities | 4,500 |  |  |  |
Unused capacity under a Canadian debt shelf prospectus | 4,500 |  |  |  |
Unused capacity under Canadian and U.S. universal shelf prospectus |  | $ 4,250 |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |  |
Derivative financial liabilities | 6,625 |  |  | 3,011 |
Derivative financial assets | 6,404 |  |  | 2,737 |
Derivative liabilities, net | 221 |  |  | $ 274 |
Liquidity Risk | Bilateral credit facilities |  |  |  |  |
Financial Liabilities |  |  |  |  |
Reduction in available borrowing capacity | 2,000 |  |  |  |
Credit facilities terminated | $ 2,800 |  |  |  |

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