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Debt and Capital Structure - Summary of Net Debt to Adjusted EBITDA (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2021 | Jun. 30, 2020
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings | $ 48 |  | $ 48 |  | $ 48 | $ 121 |  |  |  |
Current Portion of Long-Term Debt | 545 |  | 545 |  | 545 | 0 |  |  |  |
Long-Term Debt | 12,441 |  | 12,441 |  | 12,441 | 7,441 |  |  |  |
Less: Cash and Cash Equivalents | (2,010) | $ (404) | (2,010) | $ (404) | (2,010) | (378) | $ (186) |  | $ (1,055) | $ (152)
Net debt | 11,024 |  | 11,024 |  | $ 11,024 | 7,184 |  |  |  |
Net Earnings (Loss) | 551 | (194) | 995 | (2,226) |  | (2,379) | 2,194 | $ (2,916) |  |
Add (Deduct): |  |  |  |  |  |  |  |  |  |
Interest Income | (4) | (2) | (11) | (4) |  | (9) | (12) | (19) |  |
Foreign Exchange (Gain) Loss, Net | 196 | (159) | (93) | 168 |  | (181) | (404) | 854 |  |
Re-measurement of Contingent Payment | 135 | (31) | 571 | (97) |  | 80 | (164) | (50) |  |
Other (Income) Loss, Net | (107) | $ (14) | (208) | $ (52) |  | $ 40 | $ 9 | $ 13 |  |
Net Debt to Adjusted EBITDA |  |  |  |  | 170.00% | 1190.00% |  |  |  |
Rolling Twelve Month Basis |  |  |  |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings | 48 |  | 48 |  | $ 48 | $ 121 |  |  |  |
Current Portion of Long-Term Debt | 545 |  | 545 |  | 545 | 0 |  |  |  |
Long-Term Debt | 12,441 |  | 12,441 |  | 12,441 | 7,441 |  |  |  |
Less: Cash and Cash Equivalents | (2,010) |  | (2,010) |  | (2,010) | (378) |  |  |  |
Net debt | $ 11,024 |  | $ 11,024 |  | 11,024 | 7,184 |  |  |  |
Net Earnings (Loss) |  |  |  |  | 842 | (2,379) |  |  |  |
Add (Deduct): |  |  |  |  |  |  |  |  |  |
Finance Costs |  |  |  |  | 981 | 536 |  |  |  |
Interest Income |  |  |  |  | (16) | (9) |  |  |  |
Income Tax Expense (Recovery) |  |  |  |  | 276 | (851) |  |  |  |
Depreciation, Depletion and Amortization |  |  |  |  | 4,083 | 3,464 |  |  |  |
E&E Write-Down |  |  |  |  | 74 | 91 |  |  |  |
Unrealized (Gain) Loss on Risk Management |  |  |  |  | 275 | 56 |  |  |  |
Foreign Exchange (Gain) Loss, Net |  |  |  |  | (442) | (181) |  |  |  |
Re-measurement of Contingent Payment |  |  |  |  | 588 | (80) |  |  |  |
(Gain) Loss on Divestitures of Assets |  |  |  |  | (178) | (81) |  |  |  |
Other (Income) Loss, Net |  |  |  |  | (116) | 40 |  |  |  |
Share of (Income) Loss From Equity-Accounted Affiliates |  |  |  |  | (40) | 0 |  |  |  |
Adjusted EBITDA |  |  |  |  | $ 6,327 | $ 606 |  |  |  |

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