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Notes and Accounts Receivable, Net - Summary of Notes and Accounts Receivable, Net (Detail) $ in Millions, $ in Millions | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
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Disclosure of information about of trade accounts and notes receivables [Line Items] |  |  |
Notes and accounts receivable | $ 121,133.2 | $ 4,086.8 | $ 128,335.3
Cost [member] |  |  |
Disclosure of information about of trade accounts and notes receivables [Line Items] |  |  |
Notes and accounts receivable | 121,605.0 |  | 128,815.4
Allowance for doubtful receivables [member] |  |  |
Disclosure of information about of trade accounts and notes receivables [Line Items] |  |  |
Notes and accounts receivable | $ (471.8) |  | $ (480.1)

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