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Other Long-Term Assets - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 CAD ($) bbl | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2013 | Jun. 01, 2018
Disclosure of joint ventures [line items] |  |  |  |  |
North West Redwater Partnership subordinated debt | $ 652,000,000 | $ 591,000,000 |  |  |
Prepaid cost of service toll | 130,000,000 | 62,000,000 |  |  |
Borrowings | 20,982,000,000 | 20,623,000,000 |  |  |
Net earnings | 5,416,000,000 | 2,591,000,000 | $ 2,397,000,000 |  |
Non-revolving term credit facility maturing February 2021 |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility | $ 750,000,000 |  |  |  |
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 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 |  |  |  |
Company's ownership interest in joint venture | 50.00% |  |  | 50.00% |
Subordinated debt interest rate variable |  |  |  | 6.00% |
Debt to equity ratio |  |  |  | 400.00% |
Subordinated debt contributed before accrued interest | $ 439,000,000 |  |  |  |
Accrued interest | 213,000,000 |  |  |  |
North West Redwater Partnership subordinated debt | $ 652,000,000 |  |  |  |
Percent of pro rata share of debt company has committed paying to joint venture | 25.00% |  |  |  | 25.00%
Term of commitment to joint venture | 30 years |  |  |  |
Net earnings | $ (346,000,000) | (5,000,000) |  |  |
Recognized share of losses of joint ventures | 287,000,000 |  |  |  |
Investments in joint ventures | 0 |  |  |  |
Unrecognised share of losses of joint ventures | $ 59,000,000 | 0 |  |  |
North West Redwater Partnership |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Processing agreement, barrels of bitumen feedstock per day | bbl | 50,000 |  |  |  |
Processing agreement term | 30 years |  |  |  |
Facility capital cost budget for the Project | $ 10,000,000,000 |  |  |  |
Net earnings | (692,000,000) | $ (10,000,000) |  |  |
North West Redwater Partnership | Syndicated credit facility |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility | 3,500,000,000 |  |  |  |
Borrowings | 2,715,000,000 |  |  |  |
North West Redwater Partnership | Non-revolving term credit facility maturing February 2021 |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility | 1,500,000,000 |  |  |  |
Major Borrowings Transactions | North West Redwater Partnership | Syndicated credit facility |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |
Maximum credit facility | $ 2,000,000,000 |  |  |  |

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