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v3.22.1

Net Revenue - Refund Liabilities (Detail) - TWD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Accrued expenses and other current liabilities [member] |  |
Disclosure Of Refund Liabilities [Line Items] |  |
Refund liabilities | $ 41,038.0 | $ 33,194.8

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- Definition Disclosure of refund liabilities [line items] + References No definition available. + Details
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- Definition Refund liabilities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
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