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v3.21.1

Property, Plant and Equipment - Summary of assets subject to operating leases (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 Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance | $ 1,352,377.4 |  | $ 1,072,050.3 |
Additions | 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
Buildings used to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance | 63.5 |  |  |
Ending balance | 1,003.2 |  | 63.5 |
Cost [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance |  |  | 3,372,779.1 | 3,080,615.1
Additions |  |  |  | 300,024.4
Disposals or retirements |  |  |  | (7,174.2)
Ending balance |  |  |  | 3,372,779.1
Cost [member] | Buildings used to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance | 562.6 |  | 562.6 |
Transfers to assets subject to operating leases | (23.1) |  |  |
Transfers from assets subject to operating leases | 1,199.0 |  |  |
Disposals or retirements | (311.9) |  |  |
Ending balance | 1,426.6 |  | 562.6 | 562.6
Accumulated depreciation [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance |  |  | 2,300,728.8 | 2,018,072.8
Additions |  |  |  | 288,124.9
Disposals or retirements |  |  |  | (5,962.6)
Ending balance |  |  |  | 2,300,728.8
Accumulated depreciation [member] | Buildings used to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance | 499.1 |  | 474.9 |
Additions | 35.7 |  | 24.2 |
Transfers to assets subject to operating leases | (8.2) |  |  |
Transfers from assets subject to operating leases | 202.6 |  |  |
Disposals or retirements | (305.8) |  |  |
Ending balance | 423.4 |  | 499.1 | 474.9
Buildings [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance |  |  | 200,340.2 |
Ending balance |  |  |  | 200,340.2
Buildings [member] | Buildings used to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance | 63.5 |  |  |
Ending balance | 26.2 |  | 63.5 |
Buildings [member] | Cost [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance |  |  | 418,714.3 | 379,134.6
Additions |  |  |  | 40,396.4
Disposals or retirements |  |  |  | (410.9)
Ending balance |  |  |  | 418,714.3
Buildings [member] | Cost [member] | Buildings used to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance | 562.6 |  | 562.6 |
Transfers to assets subject to operating leases | (23.1) |  |  |
Disposals or retirements | (311.9) |  |  |
Ending balance | 227.6 |  | 562.6 | 562.6
Buildings [member] | Accumulated depreciation [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance |  |  | 218,374.1 | 194,446.5
Additions |  |  |  | 24,293.4
Disposals or retirements |  |  |  | (399.0)
Ending balance |  |  |  | 218,374.1
Buildings [member] | Accumulated depreciation [member] | Buildings used to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance | 499.1 |  | 474.9 |
Additions | 16.3 |  | 24.2 |
Transfers to assets subject to operating leases | (8.2) |  |  |
Disposals or retirements | (305.8) |  |  |
Ending balance | 201.4 |  | 499.1 | 474.9
Machinery and equipment [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance |  |  | 679,481.2 |
Ending balance |  |  |  | 679,481.2
Machinery and equipment [member] | Buildings used to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Ending balance | 977.0 |  |  |
Machinery and equipment [member] | Cost [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance |  |  | 2,728,760.2 | 2,487,752.3
Additions |  |  |  | 247,042.3
Disposals or retirements |  |  |  | (5,972.5)
Ending balance |  |  |  | 2,728,760.2
Machinery and equipment [member] | Cost [member] | Buildings used to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Transfers from assets subject to operating leases | 1,199.0 |  |  |
Ending balance | 1,199.0 |  |  |
Machinery and equipment [member] | Accumulated depreciation [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance |  |  | $ 2,049,279.0 | 1,795,448.9
Additions |  |  |  | 258,195.3
Disposals or retirements |  |  |  | (4,773.6)
Ending balance |  |  |  | $ 2,049,279.0
Machinery and equipment [member] | Accumulated depreciation [member] | Buildings used to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Additions | 19.4 |  |  |
Transfers from assets subject to operating leases | 202.6 |  |  |
Ending balance | $ 222.0 |  |  |

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