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Financial Instruments and Risk Management - Liquidity Risk (Details) $ in Millions, $ in Billions | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($)
--- | --- | --- | --- | ---
Financial Liabilities |  |  |  |
Cash and cash equivalents | $ 1,980 |  | $ 2,205 | $ 1,885
Total credit facilities | 7,227 |  |  |
Total unutilized credit facilities | 3,272 |  |  |
Unused capacity under the Board of Directors authority |  | $ 5.0 |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |
Trade and other payables undiscounted cash flows | 8,037 |  | 6,356 |
Gross derivative liability undiscounted cash flows | 4,370 |  | 6,625 |
Debt undiscounted cash flows | 22,299 |  | 26,231 |
Lease liabilities | 4,983 |  | 4,531 |
Within one year |  |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |
Trade and other payables undiscounted cash flows | 7,959 |  | 6,282 |
Gross derivative liability undiscounted cash flows | 3,824 |  | 6,466 |
Debt undiscounted cash flows | 3,375 |  | 2,253 |
Lease liabilities | 477 |  | 459 |
2 to 3 years |  |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |
Trade and other payables undiscounted cash flows | 39 |  | 37 |
Gross derivative liability undiscounted cash flows | 546 |  | 159 |
Debt undiscounted cash flows | 1,066 |  | 2,015 |
Lease liabilities | 807 |  | 779 |
4 to 5 years |  |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |
Trade and other payables undiscounted cash flows | 39 |  | 37 |
Debt undiscounted cash flows | 1,541 |  | 3,127 |
Lease liabilities | 652 |  | 660 |
Over 5 years |  |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |
Debt undiscounted cash flows | 16,317 |  | 18,836 |
Lease liabilities | 3,047 |  | 2,633 |
Liquidity Risk |  |  |  |
Financial Liabilities |  |  |  |
Cash and cash equivalents | 2,000 |  |  |
Total credit facilities | 7,200 |  |  |
Total unutilized credit facilities | 3,300 |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |
Derivative financial liabilities | 4,370 |  | 6,625 |
Derivative financial assets | 4,162 |  | 6,404 |
Derivative liabilities, net | $ 208 |  | $ 221 |

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