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Notes and Accounts Receivable, Net - Aging Analysis of Notes and Accounts Receivable, Net (Detail) $ in Millions, $ in Millions | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
--- | --- | --- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | $ 138,908.6 | $ 4,644.2 | $ 128,613.4 |  |
Less: Loss allowance | (325.3) |  | (7.3) | $ (471.8) | $ (480.1)
Allowance for credit losses [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Less: Loss allowance | (325.3) |  | (7.3) |  |
Not past due [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | 126,134.8 |  | 113,126.5 |  |
Past due [member] | Past due within 30 days [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | 13,082.1 |  | 15,006.5 |  |
Past due [member] | Past due 31-60 days [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | 12.8 |  | 472.8 |  |
Past due [member] | Past due 61-120 days [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | 1.0 |  | 9.5 |  |
Past due [member] | Past due over 121 days [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Notes and accounts receivable, net | $ 3.2 |  | $ 5.4 |  |

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