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v3.21.1

Significant Contingent Liabilities and Unrecognized Commitments - Additional Information (Detail) - TWD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 30, 1999 | Dec. 31, 2020 | Dec. 31, 2019
Letters of Credit [member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Amounts available under unused letters of credit |  | $ 56.2 | $ 60.0
Systems on Silicon Manufacturing Company Pte Ltd. [member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Equity interest in joint venture | 32.00% | 39.00% |
Minimum collective purchase capacity required |  | 70.00% |
Maximum purchase capacity required |  | 28.00% |
NXP B.V [member] | Systems on Silicon Manufacturing Company Pte Ltd. [member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Equity interest in joint venture |  | 61.00% |
Technical Cooperation Agreement with Industrial Technology Research Institute [member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Maximum capacity that can be used as per agreement |  | 35.00% |
Term of agreement |  | 5 years |
Renewal period of agreement |  | Automatically renewed for successive periods of five years unless otherwise terminated by either party with one year prior notice. |
Notice period for contract termination |  | 1 year |

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