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Income Tax - Current Tax Assets and Liabilities (Detail) $ in Millions, $ in Millions | Jan. 01, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
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Major Components Of Tax Expense Income [Abstract] |  |  |  |
Tax refund receivable (included in other current assets - other) |  | $ 2 |  | $ 5
Income tax payable | $ 10,901 | $ 8,674 | $ 293 | $ 6,522

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