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Operating Segments Information - Major Customers Representing at Least 10 Percent of Net Revenue (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Disclosure of major customers [line items] |  |  |  |
NET REVENUE | $ 1,587,415.0 | $ 57,224.8 | $ 1,339,254.8 | $ 1,069,985.4
Customer A [member] |  |  |  |
Disclosure of major customers [line items] |  |  |  |
NET REVENUE | $ 405,403.0 |  | $ 336,775.5 | $ 247,213.3
Percentage of entity's revenue | 26.00% | 26.00% | 25.00% | 23.00%
Customer B [member] |  |  |  |
Disclosure of major customers [line items] |  |  |  |
NET REVENUE | $ 153,740.8 |  |  |
Percentage of entity's revenue | 10.00% | 10.00% |  |
Customer C [Member] |  |  |  |
Disclosure of major customers [line items] |  |  |  |
NET REVENUE |  |  | $ 167,390.8 | $ 152,876.9
Percentage of entity's revenue |  |  | 12.00% | 14.00%

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