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Financial Instruments and Risk Management - Liquidity Risk (Details) $ in Millions, $ in Billions | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($)
--- | --- | --- | --- | ---
Financial Liabilities |  |  |  |
Cash and cash equivalents | $ 1,729 |  | $ 1,980 | $ 2,205
Total credit facilities | 6,971 |  |  |
Total unutilized credit facilities | 5,533 |  |  |
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 | 7,700 |  | 8,037 |
Gross derivative liability undiscounted cash flows | 7,118 |  | 4,370 |
Debt undiscounted cash flows | 19,916 |  | 22,299 |
Lease liabilities | 6,436 |  | 4,983 |
Within one year |  |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |
Trade and other payables undiscounted cash flows | 7,646 |  | 7,959 |
Gross derivative liability undiscounted cash flows | 6,586 |  | 3,824 |
Debt undiscounted cash flows | 1,132 |  | 3,375 |
Lease liabilities | 561 |  | 477 |
2 to 3 years |  |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |
Trade and other payables undiscounted cash flows | 53 |  | 39 |
Gross derivative liability undiscounted cash flows | 532 |  | 546 |
Debt undiscounted cash flows | 3,184 |  | 1,066 |
Lease liabilities | 991 |  | 807 |
4 to 5 years |  |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |
Trade and other payables undiscounted cash flows | 1 |  | 39 |
Debt undiscounted cash flows | 1,425 |  | 1,541 |
Lease liabilities | 846 |  | 652 |
Over 5 years |  |  |  |
Timing of cash outflows related to trade and other payables and debt |  |  |  |
Debt undiscounted cash flows | 14,175 |  | 16,317 |
Lease liabilities | 4,038 |  | 3,047 |
Liquidity Risk |  |  |  |
Financial Liabilities |  |  |  |
Cash and cash equivalents | 1,700 |  |  |
Total credit facilities | 7,000 |  | 7,000 |
Total unutilized credit facilities |  |  | 5,500 |
Timing of cash outflows related to trade and other payables and debt |  |  |  |
Derivative financial liabilities | 7,118 |  | 4,370 |
Derivative financial assets | 7,033 |  |  | 4,162
Derivative liabilities, net | $ 85 |  | $ 208 | $ 208

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