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Acquisitions - Narrative (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2021 CAD ($) share $ / shares shares | Dec. 31, 2021 CAD ($) | Sep. 08, 2021 CAD ($) | Dec. 31, 2020 CAD ($) $ / shares | Dec. 31, 2019 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Fair value of acquired receivables | $ 1,100 |  |  |  |
Gross contractual amounts receivable for acquired receivables | 1,200 |  |  |  |
Best estimate at acquisition date of contractual cash flows not expected to be collected for acquired receivables | $ 45 |  |  |  |
Goodwill |  | $ 3,473 |  | $ 2,272 | $ 2,272
Revenue of acquiree since acquisition date |  | 21,200 |  |  |
Profit (loss) of acquiree since acquisition date |  | 2,000 |  |  |
Lloydminister thermal |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Goodwill |  | 651 |  | 0 |
Sunrise |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Goodwill |  | 550 |  | 0 |
Oil Sands |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Goodwill |  | $ 3,473 |  | $ 2,272 |
Terra Nova |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Percentage of working interest acquired |  |  | 21.00% |  |
Working interest, percentage |  | 34.00% |  |  |
Consideration paid for working interest in asset acquisition |  |  | $ 3 |  |
Cash acquired in asset acquisition |  |  | 78 |  |
Property, plant and equipment acquired in asset acquisition |  |  | 84 |  |
Decommissioning liabilities assumed in asset acquisition |  |  | $ 159 |  |
Husky Energy, Inc. |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Warrant holder entitled to common share, term | 5 years |  |  |  |
Warrant, exercise price | $ / shares | $ 6.54 |  |  |  |
Fair value of warrants | $ 216 |  |  |  |
Non-Controlling Interest | 1.00% |  |  |  |
Acquisition, purchase price adjustment, increase (decrease) in accounts receivable and accrued revenues |  | $ 24 |  |  |
Acquisition, purchase price adjustment, increase (decrease) in E&E assets |  | 45 |  |  |
Acquisition, purchase price adjustment, increase (decrease) in PP&E |  | (365) |  |  |
Acquisition, purchase price adjustment, increase (decrease) in other assets |  | 32 |  |  |
Acquisition, purchase price adjustment, increase (decrease) in accounts payable and accrued liabilities |  | (18) |  |  |
Acquisition, purchase price adjustment, increase (decrease) in decommissioning liabilities |  | (137) |  |  |
Acquisition, purchase price adjustment, increase (decrease) in other liabilities |  | (37) |  |  |
Acquisition, purchase price adjustment, increase (decrease) in long-term income tax receivable |  | (136) |  |  |
Acquisition, purchase price adjustment, increase (decrease) in equity-accounted affiliates |  | (94) |  |  |
Acquisition, purchase price adjustment, increase (decrease) in income tax payable |  | (6) |  |  |
Acquisition, purchase price adjustment, increase (decrease) in goodwill |  | 577 |  |  |
Acquisition, purchase price adjustment, increase (decrease) in deferred income tax asset, net |  | 120 |  |  |
Acquisition, purchase price adjustment, increase (decrease) in net assets |  | $ (560) |  |  |
Husky Energy, Inc. | Oil Sands |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Goodwill | $ 1,300 |  |  |  |
Husky Energy, Inc. | Oil Sands | Lloydminister thermal |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Goodwill | 651 |  |  |  |
Husky Energy, Inc. | Oil Sands | Sunrise |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Goodwill | 550 |  |  |  |
Husky Energy, Inc. | Oil Sands | Tucker |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Goodwill | $ 88 |  |  |  |
Husky Energy, Inc. | Common Shares |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Consideration transferred, equity interests issued per acquiree share | shares | 0.7845 |  |  |  |
Number of instruments or interests issued or issuable | share | 788,500,000 |  |  |  |
Equity interests of acquirer | $ 6,111 |  |  |  |
Share Price | $ / shares |  |  |  | $ 7.75 |
Noncontrolling interest of acquired entity | $ 11 |  |  |  |
Husky Energy, Inc. | Share Purchase Warrants |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Consideration transferred, equity interests issued per acquiree share | shares | 0.0651 |  |  |  |
Number of instruments or interests issued or issuable | share | 65,400,000 |  |  |  |
Equity interests of acquirer | $ 216 |  |  |  |
Husky Energy, Inc. | Preferred Shares |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Number of instruments or interests issued or issuable | share | 36,000,000 |  |  |  |
Equity interests of acquirer | $ 519 |  |  |  |
Husky Energy, Inc. | Replacement Stock Options |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Consideration transferred, equity interests issued per acquiree share | shares | 0.7845 |  |  |  |
Equity interests of acquirer | $ 9 |  |  |  |

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