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Other Long-Term Assets - Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 CAD ($) bbl | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Disclosure of joint ventures [line items] |  |  |  |  |
Borrowings, interest rate | 3.80% |  |  | 3.80% |
Borrowings | $ 18,819,000,000 | $ 10,799,000,000 |  |  |
Commercial Paper |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility |  |  |  | $ 2,500,000,000 |
Borrowings | $ 672,000,000 |  |  | $ 467,000,000 | $ 0
North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Toll payer percent for others | 75.00% |  |  |  |
North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Company's voting percent interest in joint venture | 50.00% |  |  |  |
Processing agreement, barrels of bitumen feedstock per date for the Company | bbl | 12,500 |  |  |  |
Percent of pro rata share of debt company has committed paying to joint venture, toll payer percent | 25.00% |  |  |  |
Processing agreement, barrels of bitumen feedstock per date for others | bbl | 37,500 |  |  |  |
Term of commitment to joint venture | 40 years |  |  |  |
Investments in joint ventures | $ 0 |  |  |  |
Cumulative unrecognised share of losses of joint ventures | 509,000,000 | 555,000,000 |  |  |
Recovery of unrecognised share of losses of joint ventures | $ 46,000,000 |  | $ 11,000,000 |  |
Unrecognised share of losses of joint ventures |  | 4,000,000 |  |  |
North West Redwater Partnership | North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Barrels of bitumen feedstock processed per day | bbl | 50,000 |  |  |  |
Maximum credit facility | $ 2,150,000,000 | 3,115,000,000 |  |  |
Borrowings | 8,750,000,000 | 7,950,000,000 |  |  |
North West Redwater Partnership | North West Redwater Partnership | Series A Bonds |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Repayments of credit facility | $ 500,000,000 |  |  |  |
Borrowings, interest rate | 3.20% |  |  | 3.20% |
North West Redwater Partnership | North West Redwater Partnership | Series P Bonds Due June 2034 |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Borrowings, interest rate | 4.85% |  |  | 4.85% |
Maximum credit facility | $ 700,000,000 |  |  |  |
North West Redwater Partnership | North West Redwater Partnership | Series Q Bonds Due June 2054 |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Borrowings, interest rate | 5.08% |  |  | 5.08% |
Maximum credit facility | $ 600,000,000 |  |  |  |
North West Redwater Partnership | North West Redwater Partnership | Commercial Paper |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Unsecured revolving credit facility | 2,000,000,000 |  |  |  |
Borrowings | 1,459,000,000 | 0 |  |  |
North West Redwater Partnership | North West Redwater Partnership | Revolving Credit Facility |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility | 1,900,000,000 | 2,175,000,000 |  |  |
North West Redwater Partnership | North West Redwater Partnership | Non-Revolving Credit Facility |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility | 250,000,000 | 940,000,000 |  |  |
North West Redwater Partnership | North West Redwater Partnership | Syndicated Credit Facility |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility | 1,900,000,000 |  |  |  |
Reduction in maximum borrowing capacity | 275,000,000 |  |  |  |
Borrowings | 251,000,000 | 2,559,000,000 |  |  |
North West Redwater Partnership | North West Redwater Partnership | Syndicated Credit Facility, Non-Revolving |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility | 250,000,000 |  |  |  |
Repayments of line of credit facility | 657,000,000 |  |  |  |
North West Redwater Partnership | North West Redwater Partnership | Short term demand operating facility |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility | 300,000,000 | 300,000,000 |  |  |
Borrowings | 103,000,000 | 77,000,000 |  |  |
North West Redwater Partnership | North West Redwater Partnership | Bilateral Facilities |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility | $ 300,000,000 | $ 150,000,000 |  |  |

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