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Subsequent Event- Additional Information (Details) $ / shares in Units, Warrant in Millions | Jan. 01, 2021 CAD ($) shares Warrant / shares Warrant $ / shares | Dec. 31, 2020 CAD ($) $ / shares | Dec. 31, 2019 CAD ($)
--- | --- | --- | ---
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |
Available borrowing capacity |  | $ 1,100,000,000 |
Transportation and Storage |  | 21,397,000,000 | $ 21,499,000,000
Transportation Commitment |  | $ 14,000,000,000 | $ 13,000,000,000
Cenovus and Husky Merger [Member] |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |
Number of shares issued | shares | 0.7845 |  |
Number of warrants issued | Warrant / shares | 0.0651 |  |
Closing share price reported on the TSX | $ / shares |  | $ 7.75 |
Fair value of warrants transferred | $ 216,000,000 |  |
Exercise price of warrants | $ / shares | $ 6.54 |  |
Number of common shares permitted for exchange of each stock option | shares | 0.7845 |  |
Number of shares used for calculation of exercise price per share in option exchange | shares | 0.7845 |  |
Fair value of replacement stock options | $ 9,000,000 |  |
Fair value of trade and other receivables acquired | 1,100,000,000 |  |
Gross contractual amounts of trade and other receivables acquired | 1,200,000,000 |  |
Best estimate at acquisition date of contractual cash flows not expected to be collected for acquired receivables | 36,000,000 |  |
Acquisition related costs | 29,000,000 |  |
Cash | 735,000,000 |  |
Available borrowing capacity | 3,700,000,000 |  |
Uncommitted demand facilities | 508,000,000 |  |
Borrowing capacity from committed credit facilities | 4,000,000,000 |  |
Borrowing capacity from uncommitted demand facilities | 975,000,000 |  |
Amount of undrawn facilities for general purposes | 850,000,000 |  |
Total commitments | 18,700,000,000 |  |
Transportation and Storage | 7,400,000,000 |  |
Transportation Commitment | $ 1,700,000,000 |  |
Common Share [Member] | Cenovus and Husky Merger [Member] |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |
Number of instruments issued | shares | 788,500,000 |  |
Fair value of shares transferred | $ 6,100,000,000 |  |
Common Share Purchase Warrants [Member] | Cenovus and Husky Merger [Member] |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |
Number of instruments issued | Warrant | 65.4 |  |
Common Share Warrants [Member] | Cenovus and Husky Merger [Member] |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |
Fair value of warrants transferred | $ 216,000,000 |  |
Preferred Share [Member] | Cenovus and Husky Merger [Member] |  |  |
Disclosure Of Nonadjusting Events After Reporting Period [Line Items] |  |  |
Number of instruments issued | shares | 36,000,000 |  |
Fair value of shares transferred | $ 519,000,000 |  |

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