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Debt and Capital Structure - Summary of Net Debt to Adjusted EBITDA (Detail) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Dec. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2020
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings | $ 0 |  |  | $ 0 |  |  | $ 0 | $ 79 |  |  |
Long-Term Debt | 11,228 |  |  | 11,228 |  |  | 11,228 | 12,385 |  |  |
Total borrowings | 11,228 |  |  | 11,228 |  |  | 11,228 | 12,385 |  |  |
Less: Cash and Cash Equivalents | (3,693) | $ (1,055) |  | (3,693) | $ (1,055) |  | (3,693) | (2,873) | $ (3,399) | $ (873) | $ (378)
Net debt | 7,535 |  |  | 7,535 |  |  | $ 7,535 | $ 9,591 |  |  |
Net Earnings (Loss) | 2,432 | 224 | [1] | 4,057 | 444 | [1] |  |  |  |  |
Add (Deduct): |  |  |  |  |  |  |  |  |  |  |
Interest Income | (8) | (3) | [1] | (23) | (7) | [1] |  |  |  |  |
Foreign Exchange (Gain) Loss, Net | 192 | (172) | [1] | 90 | (289) | [1] |  |  |  |  |
Re-measurement of Contingent Payment | 15 | 249 | [1] | 251 | 436 | [1] |  |  |  |  |
Other (Income) Loss, Net | (38) | $ (29) | [1] | (408) | $ (101) | [1] |  |  |  |  |
Net Debt to Adjusted EBITDA |  |  |  |  |  |  | 60.00% | 120.00% |  |  |
Rolling Twelve Month Basis |  |  |  |  |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |  |  |  |  |
Short-Term Borrowings | 0 |  |  | 0 |  |  | $ 0 | $ 79 |  |  |
Current Portion of Long-Term Debt | 0 |  |  | 0 |  |  | 0 | 0 |  |  |
Long-Term Debt | 11,228 |  |  | 11,228 |  |  | 11,228 | 12,385 |  |  |
Total borrowings | 11,228 |  |  | 11,228 |  |  | 11,228 | 12,464 |  |  |
Less: Cash and Cash Equivalents | (3,693) |  |  | (3,693) |  |  | (3,693) | (2,873) |  |  |
Net debt | $ 7,535 |  |  | $ 7,535 |  |  | 7,535 | 9,591 |  |  |
Net Earnings (Loss) |  |  |  |  |  |  | 4,200 | 587 |  |  |
Add (Deduct): |  |  |  |  |  |  |  |  |  |  |
Finance Costs |  |  |  |  |  |  | 1,030 | 1,082 |  |  |
Interest Income |  |  |  |  |  |  | (39) | (23) |  |  |
Income Tax Expense (Recovery) |  |  |  |  |  |  | 1,926 | 728 |  |  |
Depreciation, Depletion and Amortization |  |  |  |  |  |  | 5,967 | 5,886 |  |  |
E&E Write-Down |  |  |  |  |  |  | (2) | 18 |  |  |
Unrealized (Gain) Loss on Risk Management |  |  |  |  |  |  | (321) | 2 |  |  |
Foreign Exchange (Gain) Loss, Net |  |  |  |  |  |  | 205 | (174) |  |  |
Re-measurement of Contingent Payment |  |  |  |  |  |  | 390 | 575 |  |  |
(Gain) Loss on Divestitures of Assets |  |  |  |  |  |  | (461) | (229) |  |  |
Other (Income) Loss, Net |  |  |  |  |  |  | (616) | (309) |  |  |
Share of (Income) Loss From Equity-Accounted Affiliates |  |  |  |  |  |  | (32) | (57) |  |  |
Adjusted EBITDA |  |  |  |  |  |  | $ 12,247 | $ 8,086 |  |  |
[1] | See Note 3 for revisions to prior period results.

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