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Notes and Accounts Receivable, Net - Aging Analysis of Notes and Accounts Receivable, Net (Detail) $ in Millions, $ in Millions | Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($)
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Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | $ 201,313.9 | $ 6,574.6 | $ 229,755.9 |  |
Less: Loss allowance | (531.5) |  | (331.6) | $ (347.0) | $ (246.6)
Allowance for credit losses [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Less: Loss allowance | (531.5) |  | (331.6) |  |
Not past due [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | 183,188.5 |  | 205,053.1 |  |
Past due [member] | Past due within 30 days [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | 18,641.1 |  | 24,516.3 |  |
Past due [member] | Past due over 31 days [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | $ 15.8 |  | $ 518.1 |  |

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