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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, 2021 TWD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2021 USD ($)
Disclosure of transactions between related parties [line items] |  |  |  |
Receivables from related parties | $ 715.3 | $ 558.1 |  | $ 25.8
Payables to related parties | 1,437.2 | 2,107.7 |  |
Other receivables from related parties | 61.5 | 50.6 |  | $ 2.2
Global Unichip Corporation [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Receivables from related parties | 597.8 | 370.6 |  |
Xintec Inc. [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Receivables from related parties | 117.5 | 187.5 |  |
Payables to related parties | 725.3 | 1,358.6 |  |
Systems on Silicon Manufacturing Company Pte Ltd. [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Payables to related parties | 349.2 | 400.8 |  |
Other receivables from related parties | 50.4 | 45.3 |  |
Vanguard International Semiconductor Corporation [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Payables to related parties | 357.2 | 311.4 |  |
Other receivables from related parties | 11.1 | 4.3 |  |
Associates [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Net revenue from sale of goods | 8,475.9 | 8,129.8 | $ 6,253.9 |
Purchases | 7,569.8 | 7,606.4 | 6,301.4 |
Contract liabilities | 726.4 |  |  |
Manufacturing expenses | 5,459.9 | 5,440.0 | $ 2,823.0 |
Other associates [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Payables to related parties | $ 5.5 | 36.9 |  |
Other receivables from related parties |  | $ 1.0 |  |

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