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Other Long-Term Assets - Narrative (Details) |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 CAD ($) bbl | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
Disclosure of joint ventures [line items] |  |  |  |  |
Toll payer percent for others |  |  | 75.00% |  |
Repayment of North West Redwater Partnership subordinated debt advances |  |  | $ 555,000,000 | $ 124,000,000 | $ 0
Borrowings |  | $ 14,694,000,000 | $ 14,694,000,000 | $ 21,453,000,000 |
North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Company's voting percent interest in joint venture |  |  | 50.00% |  |
Barrels of bitumen feedstock processed per day | bbl |  |  | 50,000 |  |
Processing agreement, barrels of bitumen feedstock per date for the Company | bbl |  |  | 12,500 |  |
Processing agreement, barrels of bitumen feedstock per date for others | bbl |  |  | 37,500 |  |
Percent of pro rata share of debt company has committed paying to joint venture, toll payer percent |  | 25.00% | 25.00% | 25.00% |
Term of commitment to joint venture |  |  | 40 years |  |
Optimization transaction extended period |  |  | 10 years |  |
Repayment of North West Redwater Partnership subordinated debt advances |  |  | $ 555,000,000 |  |
Partnership distributions |  |  | 400,000,000 |  |
Cumulative unrecognised share of losses of joint ventures |  | $ 562,000,000 | 562,000,000 | $ 153,000,000 |
Unrecognised share of losses of joint ventures |  |  | 9,000,000 | 94,000,000 | 59,000,000
Recognized share of losses of joint ventures |  |  |  |  | $ 287,000,000
Investments in joint ventures |  | $ 0 | $ 0 |  |
Subordinate Debt | North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Borrowings, interest rate |  | 6.00% | 6.00% |  |
Senior Secured Bonds | North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Borrowings, interest rate |  | 2.55% | 2.55% |  |
Syndicated credit facility | North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility |  | $ 3,500,000,000 | $ 3,500,000,000 |  |
Series L Senior Secured Bonds Due December 2023 | North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Borrowings, interest rate |  | 1.20% | 1.20% |  |
Maximum credit facility |  | $ 500,000,000 | $ 500,000,000 |  |
Series M Senior Secured Bonds Due December 2026 | North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Borrowings, interest rate |  | 2.00% | 2.00% |  |
Maximum credit facility |  | $ 500,000,000 | $ 500,000,000 |  |
Series N Senior Secured Bonds Due June 2031 | North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Borrowings, interest rate |  | 2.80% | 2.80% |  |
Maximum credit facility |  | $ 1,000,000,000 | $ 1,000,000,000 |  |
Series O Senior Secured Bonds Due June 2051 | North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Borrowings, interest rate |  | 3.75% | 3.75% |  |
Maximum credit facility |  | $ 600,000,000 | $ 600,000,000 |  |
Revolving Credit Facility Maturing June 2024 | North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility |  | $ 2,000,000,000 | $ 2,000,000,000 |  |
Maximum credit facility extended term |  | 3 years | 3 years |  |
Non Revolving Credit Facility Maturing June 2023 | North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility | $ 1,500,000,000 | $ 1,000,000,000 | $ 1,000,000,000 |  |
Maximum credit facility extended term |  | 2 years | 2 years |  |
Maximum borrowing capacity reduction |  | $ 500,000,000 |  |  |
North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Partnership distributions |  |  | $ 800,000,000 |  |
North West Redwater Partnership | North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Barrels of bitumen feedstock processed per day | bbl |  |  | 50,000 |  |
North West Redwater Partnership | North West Redwater Partnership | Alberta Petroleum Marketing Commission |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Partnership interest transferred | 50.00% |  |  |  |
North West Redwater Partnership | Syndicated credit facility | North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Borrowings |  | $ 1,981,000,000 | $ 1,981,000,000 | $ 2,866,000,000 |

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