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Other Long-Term Assets - Narrative (Details) |  | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2023 CAD ($) bbl | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($)
Disclosure of joint ventures [line items] |  |  |  |
Repayment of North West Redwater Partnership subordinated debt advances |  | $ 0 | $ 0 | $ 555,000,000
Borrowings |  | $ 10,799,000,000 | 11,445,000,000 |
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 |  |
Optimization transaction extended period |  |  |  | 10 years
Repayment of North West Redwater Partnership subordinated debt advances |  |  |  | $ 555,000,000
Partnership distributions |  |  |  | 400,000,000
Investments in joint ventures |  | $ 0 |  |
Cumulative unrecognised share of losses of joint ventures |  | 555,000,000 | 551,000,000 |
Unrecognised share of losses of joint ventures |  | $ 4,000,000 |  | $ 9,000,000
Recovery of unrecognised share of losses of joint ventures |  |  | 11,000,000 |
North West Redwater Partnership | Subordinate Debt |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Borrowings, interest rate |  |  |  | 6.00%
North West Redwater Partnership | Senior Secured Bonds |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Borrowings, interest rate |  |  |  | 2.55%
North West Redwater Partnership | Series L Senior Secured Bonds Due December 2023 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Borrowings, interest rate |  | 1.20% |  | 1.20%
Maximum credit facility |  |  |  | $ 500,000,000
Repayments of credit facility |  | $ 500,000,000 |  |
North West Redwater Partnership | Series M Senior Secured Bonds Due December 2026 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Borrowings, interest rate |  |  |  | 2.00%
Maximum credit facility |  |  |  | $ 500,000,000
North West Redwater Partnership | Series N Senior Secured Bonds Due June 2031 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Borrowings, interest rate |  |  |  | 2.80%
Maximum credit facility |  |  |  | $ 1,000,000,000
North West Redwater Partnership | Series O Senior Secured Bonds Due June 2051 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Borrowings, interest rate |  |  |  | 3.75%
Maximum credit facility |  |  |  | $ 600,000,000
North West Redwater Partnership | Syndicated credit facility |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Maximum credit facility |  | 3,115,000,000 | 3,175,000,000 |
Maximum borrowing capacity decreased |  | 60,000,000 |  |
North West Redwater Partnership | Revolving Credit Facility |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Maximum credit facility |  | 2,175,000,000 |  |
North West Redwater Partnership | Revolving Credit Facility Maturing in June 2024 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Maximum credit facility |  | 118,000,000 |  |
North West Redwater Partnership | Non Revolving Credit Facility Maturing June 2025 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Maximum credit facility |  | $ 940,000,000 |  |
North West Redwater Partnership | Letter of Credit |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Maximum credit facility |  |  | 150,000,000 |
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 | Syndicated credit facility |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Borrowings |  | $ 2,559,000,000 | 2,318,000,000 |
North West Redwater Partnership | North West Redwater Partnership | Short term demand operating facility |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Borrowings |  | $ 77,000,000 | $ 0 |
North West Redwater Partnership | North West Redwater Partnership | Alberta Petroleum Marketing Commission |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Partnership interest transferred | 50.00% |  |  |

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