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Debt and Capital Structure - Schedule of Net Debt to Adjusted Funds Flow (Details) - 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
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Net debt | $ 7,535 |  | $ 7,535 |  | $ 7,535 | $ 9,591
Cash flows from (used in) operating activities | 2,979 | $ 1,369 | 4,344 | $ 1,597 | 8,666 | 5,919
Settlement of Decommissioning Liabilities | (27) | (18) | (46) | (29) | (119) | (102)
Increase (Decrease) in Working Capital, Operating Activities | $ (92) | $ (430) | $ (1,291) | $ (1,332) | (1,186) | (1,227)
Adjusted Funds Flow |  |  |  |  | $ 9,971 | $ 7,248
Net Debt to Adjusted Funds Flow |  |  |  |  | 80.00% | 130.00%

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