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Share Capital - Additional Information (Detail) - shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of classes of share capital [Line Items] |  |  |
Maximum percentage of preferred stock upon issuance or outstanding of common stock | 20.00% |  |
Number of common shares authorized | unlimited |  |
Shares outstanding | 1,228,870,000 | 1,228,828,000 | 1,228,790,000
Preferred Shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Shares outstanding | 0 | 0 |
Stock Option Plan [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Shares available for future issuance | 27,000,000 | 26,000,000 |

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- Definition Number of common shares authorised. + References No definition available. + Details
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Period Type: | duration

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- Definition Percentage of outstanding shares authorized for issuance. + References No definition available. + Details
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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 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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Balance Type: | na
Period Type: | instant

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- Definition The number of shares reserved for issue under options and contracts for the sale of shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 79 -Subparagraph a -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_79_a_vii&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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- Details
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