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Related Party Transactions - Summary of Significant Transactions between the Company and Other Related Parties (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2019 USD ($)
Disclosure of transactions between related parties [line items] |  |  |  |
Net revenue from sale of goods | $ 6,253.9 | $ 8,980.4 | $ 8,496.1 |
Receivables from related parties | 862.1 | 584.4 |  | $ 28.8
Payables to related parties | 1,434.9 | 1,376.5 |  |
Other receivables from related parties | 51.6 | 65.0 |  | $ 1.7
Global Unichip Corporation [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Receivables from related parties | 741.9 | 481.9 |  |
Xintec Inc. [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Receivables from related parties | 120.2 | 102.5 |  |
Payables to related parties | 736.9 | 649.8 |  |
Systems on Silicon Manufacturing Company Pte Ltd. [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Payables to related parties | 487.9 | 362.6 |  |
Other receivables from related parties | 46.5 | 53.8 |  |
Vanguard International Semiconductor Corporation [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Payables to related parties | 154.0 | 357.1 |  |
Other receivables from related parties | 3.9 | 10.4 |  |
Associates [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Net revenue from sale of goods | 6,253.9 | 8,980.1 | 8,496.0 |
Net revenue from royalties | 183.6 | 362.3 | 482.5 |
Related Party Categories | 6,301.4 | 8,809.5 | 9,904.6 |
Manufacturing expenses | 2,823.0 | 2,974.6 | 2,196.1 |
Research and development expenses | 163.4 | 83.1 | 69.8 |
Other related parties [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Net revenue from sale of goods |  | 0.3 | 0.1 |
General and administrative expenses | 120.0 | 120.8 | $ 101.5 |
Other associates [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Payables to related parties | 56.1 | 7.0 |  |
Other receivables from related parties | $ 1.2 | $ 0.8 |  |

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