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Notes and Accounts Receivable, Net - Aging Analysis of Notes and Accounts Receivable, Net (Detail) $ in Millions, $ in Millions | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
--- | --- | --- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | $ 197,586.1 | $ 7,122.8 | $ 145,480.3 |  |
Less: Loss allowance | (347.0) |  | (246.6) | $ (325.3) | $ (7.3)
Allowance for credit losses [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Less: Loss allowance | (347.0) |  | (246.6) |  |
Not past due [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | 191,740.0 |  | 140,933.6 |  |
Past due [member] | Past due within 30 days [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | 6,186.8 |  | 4,784.4 |  |
Past due [member] | Past due 31-60 days [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | 6.2 |  | 8.7 |  |
Past due [member] | Past due 61-120 days [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | 0.1 |  | 0.1 |  |
Past due [member] | Past due over 121 days [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | $ 0.0 |  | $ 0.1 |  |

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