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Acquisitions - Narrative (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2021 CAD ($) share $ / shares shares | Sep. 30, 2021 CAD ($) | Sep. 30, 2021 CAD ($) | Sep. 08, 2021 CAD ($) | Dec. 31, 2020 CAD ($) $ / shares
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Revenue of acquiree since acquisition date |  | $ 6,700 | $ 15,900 |  |
Profit (loss) of acquiree since acquisition date |  | $ 656 | $ 1,700 |  |
Terra Nova |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Percentage of working interest acquired |  |  |  | 21.00% |
Working interest, percentage |  | 34.00% | 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 |  |  |  |
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 |  |  |  |  | $ 36
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
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. | Cenovus Replacement Stock Options |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Equity interests of acquirer | $ 9 |  |  |  |
Number of share options per replacement stock option (in shares) | shares | 0.7845 |  |  |  |

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