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Share Capital - Schedule of Paid in Surplus Includes Stock Based Compensation Expense (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reserves within equity [line items] |  |
Beginning Balance | $ 4,377 | $ 4,367
Stock-Based Compensation Expense | 14 | 10
Ending Balance | 4,391 | 4,377
Pre-Arrangement Earnings [member] |  |
Disclosure of reserves within equity [line items] |  |
Beginning Balance | 4,086 | 4,086
Stock-Based Compensation Expense | 0 | 0
Ending Balance | 4,086 | 4,086
Stock-Based Compensation [member] |  |
Disclosure of reserves within equity [line items] |  |
Beginning Balance | 291 | 281
Stock-Based Compensation Expense | 14 | 10
Ending Balance | $ 305 | $ 291

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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 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of expense from share-based payment transactions with employees. + 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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Period Type: | duration

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- Details
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- Details
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Balance Type: |
Period Type: |