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Trade Notes and Accounts Receivable, Net - Summary of Trade 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] |  |  |
Trade notes and accounts receivable | $ 31,941 | $ 1,077 | $ 31,022
Gross carrying amount [Member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Trade notes and accounts receivable | 34,058 |  | 32,795
Allowance for doubtful accounts [Member] |  |  |
Disclosure of financial assets [Line Items] |  |  |
Trade notes and accounts receivable | $ (2,117) |  | $ (1,773)

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