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Share Capital - Summary of Share Capital (Detail) - CAD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Classes Of Share Capital [Abstract] |  |
Outstanding, Beginning of Year | 1,228,828 | 1,228,790
Common Shares Issued Under Stock Option Plan (Note 32) | 42 | 38
Outstanding, End of Year | 1,228,870 | 1,228,828
Outstanding, Beginning of Year | $ 11,040 | $ 11,040
Common Shares Issued Under Stock Option Plan (Note 32) | 0 | 0
Outstanding, End of Year | $ 11,040 | $ 11,040

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- Definition Common shares issued in amount under stock option plan. + References No definition available. + Details
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- Definition Number of common shares issued under stock options plan. + References No definition available. + Details
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- Definition The nominal value of capital issued. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2020-01-01 + Details
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