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Short-Term Borrowings - Additional Information (Details) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($)
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Uncommitted demand facilities | $ 1,100,000,000 |  |
Amount of drawn facility | 0 |  |
Outstanding letters of credit | 441,000,000 |  | $ 364,000,000
Cenovus Energy Inc. [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Amount of drawn facility | 121,000,000 | $ 95,000,000 |
WRB [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Uncommitted demand facilities |  | 55,000,000 |
Amount of drawn facility |  | 190,000,000 |
Top of Range [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Uncommitted demand facilities | 1,600,000,000 |  |
Amount of undrawn facilities for general purposes | $ 600,000,000 |  |
Top of Range [Member] | WRB [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing facilities |  | 300,000,000 |
Top of Range [Member] | WRB [Member] | Cenovus Energy Inc. [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowing facilities |  | $ 150,000,000 |

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- Definition Amount of drawn borrowing facilities. + References No definition available. + Details
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- Definition Borrowing facilities. + References No definition available. + Details
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- Definition Letters of credit issued as security for performance. + References No definition available. + Details
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- Definition Amount of undrawn borrowing facilities that may be available for general purposes. + References No definition available. + Details
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- Definition The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 50 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_50_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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