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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, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance | $ 1,072,050.3 |  | $ 1,062,542.3 |
Additions | 564,283.0 |  | 300,024.4 | $ 322,493.9
Ending balance | 1,352,377.4 | $ 45,214.9 | 1,072,050.3 | 1,062,542.3
Buildings used to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Ending balance | 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 | 2,773,250.8
Additions |  |  | 300,024.4 | 322,493.9
Ending balance |  |  | 3,372,779.1 | 3,080,615.1
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 | 1,775,473.1
Additions |  |  | 288,124.9 | 255,796.0
Ending balance |  |  | 2,300,728.8 | 2,018,072.8
Accumulated depreciation [member] | Buildings used to operating leases [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Ending balance | 63.5 |  |  |
Buildings [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance | 200,340.2 |  | 184,688.1 |
Ending balance |  |  | 200,340.2 | 184,688.1
Buildings [member] | Cost [member] |  |  |  |
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items] |  |  |  |
Beginning balance | 418,714.3 |  | 379,134.6 | 304,404.5
Additions |  |  | 40,396.4 | 75,594.7
Ending balance |  |  | 418,714.3 | 379,134.6
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 |  |  |
Ending balance | 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 | 174,349.1
Additions |  |  | 24,293.4 | 20,844.6
Ending balance |  |  | 218,374.1 | $ 194,446.5
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 | 474.9 |  |  |
Additions | 24.2 |  |  |
Ending balance | $ 499.1 |  | $ 474.9 |

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- Definition The increase (decrease) in property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_a&doctype=Standard -URIDate 2019-03-27 + Details
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