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Trade Notes and Accounts Receivable, Net - Summary of Trade Notes and Accounts Receivable, Net (Detail) $ in Millions, $ in Millions | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Jan. 01, 2019 TWD ($)
--- | --- | --- | --- | ---
Disclosure Of Financial Assets [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 22,622 | $ 806 | $ 26,408 | $ 30,076
Less: Loss allowance | (2,154) |  | (2,360) |
Gross carrying amount [Member] |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |
Trade notes and accounts receivable | $ 24,776 |  | $ 28,768 |

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