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Share Capital and Warrants - Schedule of Paid in Surplus Includes Stock Based Compensation Expense (Detail) - CAD ($) $ in Millions | 2 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reserves within equity [line items] |  |  |  |
Beginning Balance |  | $ 4,391 | $ 4,377 |
Stock-Based Compensation Expense |  | 159 | 49 | $ 67
Purchase of Common Shares Under NCIB |  | (120) |  |
Common Shares Issued on Exercise of Stock Options |  | (1) |  |
Ending Balance | $ 4,284 | 4,284 | 4,391 | 4,377
NSRs and NCIB |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Stock-Based Compensation Expense |  | 14 | 14 |
Earnings Prior to Encana Split |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Beginning Balance |  | 4,086 | 4,086 |
Purchase of Common Shares Under NCIB |  | 0 |  |
Common Shares Issued on Exercise of Stock Options |  | 0 |  |
Ending Balance | 4,086 | 4,086 | 4,086 | 4,086
Earnings Prior to Encana Split | NSRs and NCIB |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Stock-Based Compensation Expense |  | 0 | 0 |
Stock-Based Compensation |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Beginning Balance |  | 305 | 291 |
Purchase of Common Shares Under NCIB |  | 0 |  |
Common Shares Issued on Exercise of Stock Options |  | (1) |  |
Ending Balance | 318 | 318 | 305 | 291
Stock-Based Compensation | NSRs and NCIB |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Stock-Based Compensation Expense |  | 14 | 14 |
Common shares |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Beginning Balance |  | 0 | 0 |
Purchase of Common Shares Under NCIB | (120) | (120) |  |
Common Shares Issued on Exercise of Stock Options |  | 0 |  |
Ending Balance | $ (120) | (120) | 0 | $ 0
Common shares | NSRs and NCIB |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Stock-Based Compensation Expense |  | $ 0 | $ 0 |

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- Definition The amount received or receivable from the issuance of the entity's shares in excess of nominal value and amounts received from other transactions involving the entity's stock or stockholders. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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