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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, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($)
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Disclosure Of Financial Assets [Line Items] |  |  |
Trade notes and accounts receivable | $ 30,076 | $ 983 | $ 31,941
Less: Loss allowance | (2,602) |  | (2,117)
Gross carrying amount [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Trade notes and accounts receivable | $ 32,678 |  | $ 34,058

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