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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, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure of major customers [line items] |  |  |  |
NET REVENUE | $ 2,894,307.7 | $ 88,268.0 | $ 2,161,735.8 | $ 2,263,891.3
Customer A [member] |  |  |  |
Disclosure of major customers [line items] |  |  |  |
NET REVENUE | $ 624,345.5 |  | $ 546,550.9 | $ 529,649.2
Percentage of entity's revenue | 22.00% | 22.00% | 25.00% | 23.00%
Customer B [member] |  |  |  |
Disclosure of major customers [line items] |  |  |  |
NET REVENUE | $ 352,271.2 |  |  |
Percentage of entity's revenue | 12.00% | 12.00% |  |
Customer C [Member] |  |  |  |
Disclosure of major customers [line items] |  |  |  |
NET REVENUE |  |  | $ 241,152.4 |
Percentage of entity's revenue |  |  | 11.00% |

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