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Other Long-Term Assets - Summary of Assets, Liabilities, Partners' Equity and Equity (Income) Loss (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of joint ventures [line items] |  |  |  |
Current assets | $ 4,487 | $ 3,020 |  |
Current liabilities | 6,637 | 4,762 |  |
Partners’ equity | 34,991 | 31,974 | $ 31,653 |
Product sales | 24,394 | 22,282 | 18,360 | [1]
Net loss | (5,416) | (2,591) | $ (2,397) |
North West Redwater Partnership |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Current assets | 124 | 105 |  |
Non-current assets | 5,664 | 5,625 |  |
Current liabilities | 192 | 176 |  |
Non-current liabilities | 5,655 | 5,267 |  |
Partners’ equity | (59) | 287 |  |
Product sales | 868 | 0 |  |
Net loss | 346 | 5 |  |
North West Redwater Partnership |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Current assets | 248 | 210 |  |
Non-current assets | 11,328 | 11,250 |  |
Current liabilities | 384 | 352 |  |
Non-current liabilities | 11,310 | 10,534 |  |
Partners’ equity | (118) | 574 |  |
Product sales | 1,736 | 0 |  |
Net loss | $ 692 | $ 10 |  |
[1] | In connection with adoption of IFRS 15 on January 1, 2018, the Company has reclassified certain comparative amounts in a manner consistent with the presentation adopted for the year ended December 31, 2018.

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