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General and Administrative - Summary of General and Administrative Expenses (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
General And Administrative Expenses [Abstract] |  |  |
Salaries and Benefits | $ 145 | $ 143 | $ 205
Administrative and Other | 84 | 95 | 177
Onerous Contract Provisions (Recovery) | 18 | (5) | 629
Stock-Based Compensation Expense (Note 32) | 49 | 67 | 9
Other Long-Term Incentive Expense (Recovery) | (4) | 31 |
General and Administrative Expense | $ 292 | $ 331 | $ 1,020

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- Definition The amount of expense relating to general and administrative activities of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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