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Notes and Accounts Receivable, Net - Aging Analysis of Notes and Accounts Receivable, Net (Detail) $ in Millions, $ in Millions | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
--- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |
Notes and accounts receivable, net | $ 121,133.2 | $ 4,086.8 | $ 128,335.3
Past due over 121 days [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notes and accounts receivable, net | 341.4 |  |
Neither past due nor impaired [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notes and accounts receivable, net | 105,295.2 |  | 108,411.4
Past due but not impaired [member] | Past due within 30 days [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notes and accounts receivable, net | 13,984.1 |  | 15,017.8
Past due but not impaired [member] | Past due 31-60 days [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notes and accounts receivable, net | 929.7 |  | 1,844.8
Past due but not impaired [member] | Past due 61-120 days [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notes and accounts receivable, net | $ 582.8 |  | $ 3,061.3

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