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Property, Plant and Equipment - Summary of Property, Plant and Equipment-2018 (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 detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance | $ 1,352,377.4 |  | $ 1,072,050.3 |
Additions (Deductions) | 525,720.7 |  | 564,283.0 | $ 300,024.4
Ending balance | $ 1,555,589.1 | $ 55,398.5 | 1,352,377.4 | 1,072,050.3
Land and Land Improvements [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 3,460.8 |
Ending balance |  |  |  | 3,460.8
Buildings [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 200,340.2 |
Ending balance |  |  |  | 200,340.2
Machinery and equipment |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 679,481.2 |
Impairment |  |  |  | 423.5
Ending balance |  |  |  | 679,481.2
Office equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 15,857.1 |
Ending balance |  |  |  | 15,857.1
Equipment under installation and construction in progress [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 172,911.0 |
Ending balance |  |  |  | 172,911.0
Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 3,372,779.1 | 3,080,615.1
Additions (Deductions) |  |  |  | 300,024.4
Disposals or retirements |  |  |  | (7,174.2)
Effect of exchange rate changes |  |  |  | (686.2)
Ending balance |  |  |  | 3,372,779.1
Cost [member] | Land and Land Improvements [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 4,011.4 | 3,983.2
Effect of exchange rate changes |  |  |  | 28.2
Ending balance |  |  |  | 4,011.4
Cost [member] | Buildings [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 418,714.3 | 379,134.6
Additions (Deductions) |  |  |  | 40,396.4
Disposals or retirements |  |  |  | (410.9)
Effect of exchange rate changes |  |  |  | (405.8)
Ending balance |  |  |  | 418,714.3
Cost [member] | Machinery and equipment |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 2,728,760.2 | 2,487,752.3
Additions (Deductions) |  |  |  | 247,042.3
Disposals or retirements |  |  |  | (5,972.5)
Effect of exchange rate changes |  |  |  | (61.9)
Ending balance |  |  |  | 2,728,760.2
Cost [member] | Office equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 48,382.2 | 42,391.5
Additions (Deductions) |  |  |  | 6,773.4
Disposals or retirements |  |  |  | (790.8)
Effect of exchange rate changes |  |  |  | 8.1
Ending balance |  |  |  | 48,382.2
Cost [member] | Equipment under installation and construction in progress [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 172,911.0 | 167,353.5
Additions (Deductions) |  |  |  | 5,812.3
Effect of exchange rate changes |  |  |  | (254.8)
Ending balance |  |  |  | 172,911.0
Accumulated depreciation [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 2,300,728.8 | 2,018,072.8
Additions (Deductions) |  |  |  | 288,124.9
Disposals or retirements |  |  |  | (5,962.6)
Impairment |  |  |  | 423.5
Effect of exchange rate changes |  |  |  | 70.2
Ending balance |  |  |  | 2,300,728.8
Accumulated depreciation [member] | Land and Land Improvements [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 550.6 | 510.5
Additions (Deductions) |  |  |  | 20.9
Effect of exchange rate changes |  |  |  | 19.2
Ending balance |  |  |  | 550.6
Accumulated depreciation [member] | Buildings [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 218,374.1 | 194,446.5
Additions (Deductions) |  |  |  | 24,293.4
Disposals or retirements |  |  |  | (399.0)
Effect of exchange rate changes |  |  |  | 33.2
Ending balance |  |  |  | 218,374.1
Accumulated depreciation [member] | Machinery and equipment |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | 2,049,279.0 | 1,795,448.9
Additions (Deductions) |  |  |  | 258,195.3
Disposals or retirements |  |  |  | (4,773.6)
Impairment |  |  |  | 423.5
Effect of exchange rate changes |  |  |  | (15.1)
Ending balance |  |  |  | 2,049,279.0
Accumulated depreciation [member] | Office equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning balance |  |  | $ 32,525.1 | 27,666.9
Additions (Deductions) |  |  |  | 5,615.3
Disposals or retirements |  |  |  | (790.0)
Effect of exchange rate changes |  |  |  | 32.9
Ending balance |  |  |  | $ 32,525.1

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