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Financial Instruments and Financial Risk Management - Summary of Contractual Undiscounted Cash Flow Requirements for Financial Liabilities (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 CAD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Lease liabilities | $ 692 | $ 672 |  | $ 680
Interest on lease liabilities (Note 21(c)) | 37 | $ 39 |  |
Liquidity risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade accounts payable and other liabilities | 2,736 |  |  |
Debt (Note 19(f)) | 6,337 |  |  |
Lease liabilities | 1,157 |  |  |
Other liabilities |  |  | $ 268 |
Estimated interest payments on debt | 4,416 |  |  |
Interest on lease liabilities (Note 21(c)) | 68 |  |  |
Liquidity risk | QB2 |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Estimated interest payments on debt |  |  | 1,202 |
Liquidity risk | Joint ventures where entity is venturer [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Advances received |  |  | 941 |
Less Than 1 Year | Liquidity risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade accounts payable and other liabilities | 2,736 |  |  |
Debt (Note 19(f)) | 115 |  |  |
Lease liabilities | 146 |  |  |
Other liabilities |  |  | 0 |
Estimated interest payments on debt | 270 |  |  |
Interest on lease liabilities (Note 21(c)) | 12 |  |  |
Less Than 1 Year | Liquidity risk | QB2 |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Estimated interest payments on debt |  |  | 0 |
Less Than 1 Year | Liquidity risk | Joint ventures where entity is venturer [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Advances received |  |  | 0 |
2–3 Years | Liquidity risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade accounts payable and other liabilities | 0 |  |  |
Debt (Note 19(f)) | 500 |  |  |
Lease liabilities | 175 |  |  |
Other liabilities |  |  | 193 |
Estimated interest payments on debt | 530 |  |  |
Interest on lease liabilities (Note 21(c)) | 11 |  |  |
2–3 Years | Liquidity risk | QB2 |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Estimated interest payments on debt |  |  | 0 |
2–3 Years | Liquidity risk | Joint ventures where entity is venturer [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Advances received |  |  | 0 |
4–5 Years | Liquidity risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade accounts payable and other liabilities | 0 |  |  |
Debt (Note 19(f)) | 677 |  |  |
Lease liabilities | 130 |  |  |
Other liabilities |  |  | 21 |
Estimated interest payments on debt | 528 |  |  |
Interest on lease liabilities (Note 21(c)) | 7 |  |  |
4–5 Years | Liquidity risk | QB2 |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Estimated interest payments on debt |  |  | 0 |
4–5 Years | Liquidity risk | Joint ventures where entity is venturer [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Advances received |  |  | 0 |
Thereafter | Liquidity risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade accounts payable and other liabilities | 0 |  |  |
Debt (Note 19(f)) | 5,045 |  |  |
Lease liabilities | 706 |  |  |
Other liabilities |  |  | 54 |
Estimated interest payments on debt | 3,088 |  |  |
Interest on lease liabilities (Note 21(c)) | $ 38 |  |  |
Thereafter | Liquidity risk | QB2 |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Estimated interest payments on debt |  |  | 1,202 |
Thereafter | Liquidity risk | Joint ventures where entity is venturer [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Advances received |  |  | $ 941 |

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