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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, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
Disclosure of major customers [line items] |  |  |  |
NET REVENUE | $ 1,339,254.8 | $ 47,694.3 | $ 1,069,985.4 | $ 1,031,473.6
Customer A [member] |  |  |  |
Disclosure of major customers [line items] |  |  |  |
NET REVENUE | $ 336,775.5 |  | $ 247,213.3 | $ 224,690.7
Percentage of entity's revenue | 25.00% | 25.00% | 23.00% | 22.00%
Customer B [member] |  |  |  |
Disclosure of major customers [line items] |  |  |  |
NET REVENUE | $ 167,390.8 |  | $ 152,876.9 | $ 83,885.6
Percentage of entity's revenue | 12.00% | 12.00% | 14.00% | 8.00%

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