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Financial Instruments and Financial Risk Management - Summary of Contractual Undiscounted Cash Flow Requirements for Financial Liabilities (Detail) - CAD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Lease liabilities (Note 20(b)) | $ 672 | $ 672 | $ 338 | $ 680
Interest on lease liabilities (Note 20(c)) |  | 39 | $ 24 |
Liquidity risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade accounts payable and other liabilities (Note 18) | 2,498 | 2,498 |  |
Debt (Note 19(d)) | 4,198 | 4,198 |  |
Lease liabilities (Note 20(b)) | 1,140 | 1,140 |  |
Estimated interest payments on debt | 4,215 | 4,215 |  |
Interest on lease liabilities (Note 20(c)) | 65 |  |  |
Less Than 1 Year | Liquidity risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade accounts payable and other liabilities (Note 18) | 2,498 | 2,498 |  |
Debt (Note 19(d)) | 29 | 29 |  |
Lease liabilities (Note 20(b)) | 162 | 162 |  |
Estimated interest payments on debt | 235 | 235 |  |
Interest on lease liabilities (Note 20(c)) | 9 |  |  |
2–3 Years | Liquidity risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade accounts payable and other liabilities (Note 18) | 0 | 0 |  |
Debt (Note 19(d)) | 414 | 414 |  |
Lease liabilities (Note 20(b)) | 193 | 193 |  |
Estimated interest payments on debt | 444 | 444 |  |
Interest on lease liabilities (Note 20(c)) | 11 |  |  |
4–5 Years | Liquidity risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade accounts payable and other liabilities (Note 18) | 0 | 0 |  |
Debt (Note 19(d)) | 286 | 286 |  |
Lease liabilities (Note 20(b)) | 109 | 109 |  |
Estimated interest payments on debt | 410 | 410 |  |
Interest on lease liabilities (Note 20(c)) | 6 |  |  |
More Than 5 Years | Liquidity risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade accounts payable and other liabilities (Note 18) | 0 | 0 |  |
Debt (Note 19(d)) | 3,469 | 3,469 |  |
Lease liabilities (Note 20(b)) | 676 | 676 |  |
Estimated interest payments on debt | 3,126 | $ 3,126 |  |
Interest on lease liabilities (Note 20(c)) | $ 39 |  |  |

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