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Notes and Accounts Receivable, Net - Summary of Notes and Accounts Receivable, Net (Detail) $ in Millions, $ in Millions | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
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Disclosure of information about of trade accounts and notes receivables [line items] |  |  |  |
Less: Loss allowance | $ (246.6) |  | $ (325.3) | $ (7.3)
Notes and accounts receivable | 145,480.3 | $ 5,180.9 | 138,908.6 |
Trade receivables [member] |  |  |  |
Disclosure of information about of trade accounts and notes receivables [line items] |  |  |  |
Notes and accounts receivable | 142,525.0 |  | 135,652.7 |
Trade receivables [member] | Amortized cost [member] |  |  |  |
Disclosure of information about of trade accounts and notes receivables [line items] |  |  |  |
Less: Loss allowance | (246.6) |  | (325.3) |
Notes and accounts receivable | 142,771.6 |  | 135,978.0 |
Trade receivables [member] | FVTOCI [member] |  |  |  |
Disclosure of information about of trade accounts and notes receivables [line items] |  |  |  |
Notes and accounts receivable | $ 2,955.3 |  | $ 3,255.9 |

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