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OTHER LONG-TERM ASSETS - Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CAD ($) bbl | Dec. 31, 2013 | Mar. 21, 2018 CAD ($) | Dec. 31, 2016 CAD ($)
Disclosure of joint ventures [line items] |  |  |  |
North West Redwater Partnership subordinated debt | $ 510,000,000 |  |  | $ 385,000,000
Borrowings | $ 22,458,000,000 |  |  | 16,805,000,000
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% |  |
Subordinated debt contributed before accrued interest | $ 411,000,000 |  |  |
Accrued interest | 99,000,000 |  |  |
North West Redwater Partnership subordinated debt | $ 510,000,000 |  |  |
Percent of pro rata share of debt company has committed paying to joint venture | 25.00% |  |  |
Term of commitment to joint venture | 30 years |  |  |
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 | $ 9,500,000,000 |  |  |
Possible percentage increase in the facility capital cost budget | 2.00% |  |  |
North West Redwater Partnership | 2.80% Series J Senior Secured Bonds Due June 2027 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Bonds issued | $ 750,000,000 |  |  |
Bonds issued, interest rate | 2.80% |  |  |
North West Redwater Partnership | 3.65% Series K Senior Secured Bonds Due June 2035 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Bonds issued | $ 750,000,000 |  |  |
Bonds issued, interest rate | 3.65% |  |  |
North West Redwater Partnership | 4.25% Series F Senior Secured Bonds Due June 2029 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Bonds issued |  |  |  | $ 550,000,000
Bonds issued, interest rate |  |  |  | 4.25%
North West Redwater Partnership | 4.75% Percent Series G Senior Secured Bonds Due June 2037 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Bonds issued |  |  |  | $ 500,000,000
Bonds issued, interest rate |  |  |  | 4.75%
North West Redwater Partnership | 4.15% Series H Senior Secured Bonds Due June 2033 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Bonds issued |  |  |  | $ 500,000,000
Bonds issued, interest rate |  |  |  | 4.15%
North West Redwater Partnership | 4.35% Series I Senior Secured Bonds Due January 2039 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Bonds issued |  |  |  | $ 500,000,000
Bonds issued, interest rate |  |  |  | 4.35%
North West Redwater Partnership | Syndicated credit facility |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Borrowings | $ 1,870,000,000 |  |  |
Maximum credit facility | $ 3,500,000,000 |  |  |
Major debt transactions | North West Redwater Partnership | Syndicated credit facility |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Maximum credit facility |  |  | $ 2,000,000,000 |
Major debt transactions | North West Redwater Partnership | Non-Revolving Term Credit Facility Maturing February 2020 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Maximum credit facility |  |  | $ 1,500,000,000 |

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