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Acquisitions - Sunrise Oil Sands Partnership Narrative (Details) $ in Millions |  |  | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2022 CAD ($) $ / bbl | Jun. 13, 2022 CAD ($) | Aug. 31, 2022 CAD ($) $ / bbl | Aug. 30, 2022 | Dec. 31, 2022 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Revenue of acquiree since acquisition date |  |  |  |  | $ 599.0
Profit (loss) of acquiree since acquisition date |  |  |  |  | 0.0
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  | 67,800.0
Profit (loss) of combined entity as if combination occurred at beginning of period |  |  |  |  | 6,600.0
Sunrise Oil Sands Partnership |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Proportion of ownership interest in joint operation |  | 35.00% |  | 50.00% |
Sunrise Oil Sands Partnership |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Agreement to purchase remaining ownership | 50.00% |  |  |  |
Measurement period adjustments recognised for particular assets, liabilities, non-controlling interests or items of consideration |  |  |  |  | 26.0
Fair value of accounts receivable and accrued revenues recognised as of acquisition date | $ 164.0 |  | $ 164.0 |  |
Gross cash transferred in acquisition | 600.0 |  | 600.0 |  |
Initial Recognition | $ 600.0 | $ 600.0 | 600.0 |  |
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination |  |  | $ 40.0 |  |
Contingent consideration, price per barrel (in dollars per share) | $ / bbl | 52.00 |  | 52.00 |  |
Contingent consideration, quarterly payment | $ 2.8 |  | $ 2.8 |  |
Initial Recognition | 600.0 |  | 600.0 |  |
Investment in Equity-Accounted Affiliates | 1,559.0 |  | 1,559.0 |  |
Carrying value of investment in joint ventures recognised​ as of​ acquisition​ date | $ 960.0 |  | $ 960.0 |  |
Non-cash revaluation gain, before tax |  |  |  |  | 599.0
Non-cash revaluation gain, after tax |  |  |  |  | $ 457.0
Sunrise Oil Sands Partnership | Bottom of range |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Contingent consideration, price per barrel (in dollars per share) | $ / bbl | 52.00 |  | 52.00 |  |
Sunrise Oil Sands Partnership | Top of range |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Contingent consideration, price per barrel (in dollars per share) | $ / bbl | 53.00 |  | 53.00 |  |

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