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Investments Accounted for Using Equity Method - Reconciliation of Summarized Financial Information to Carrying Amount of Interest in Associate (Systems on Silicon Manufacturing Company Pte Ltd.) (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($)
Disclosure of associates [line items] |  |  |
Carrying amount of the investment | $ 19,585.3 | $ 17,731.8 | $ 598.2
Systems on Silicon Manufacturing Company Pte Ltd. [member] |  |  |
Disclosure of associates [line items] |  |  |
Net assets | $ 17,912.3 |  |
Percentage of ownership | 39.00% |  |
The Company's share of net assets of the associate | $ 6,948.2 |  |
Goodwill | 214.0 |  |
Other adjustments | 1.3 |  |
Carrying amount of the investment | $ 7,163.5 | $ 5,677.6 |

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