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Property, Plant and Equipment - Summary of Future Aggregate Lease Collection under Operating Lease for Freehold Plant, Property and Equipment - Assets Subject to Operating Leases (Detail) - TWD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | $ 434 | $ 471
Year 1 [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 115 | 113
Year 2 [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 95 | 91
Year 3 [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 75 | 71
Year 4 [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 53 | 61
Year 5 [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 38 | 39
Onwards [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 58 | 96
Assets Subject to Operating Leases [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 2,335 | 2,354
Assets Subject to Operating Leases [Member] | Year 1 [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 347 | 302
Assets Subject to Operating Leases [Member] | Year 2 [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 288 | 273
Assets Subject to Operating Leases [Member] | Year 3 [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 231 | 234
Assets Subject to Operating Leases [Member] | Year 4 [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 164 | 191
Assets Subject to Operating Leases [Member] | Year 5 [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 125 | 130
Assets Subject to Operating Leases [Member] | Onwards [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | $ 1,180 | $ 1,224

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of undiscounted operating lease payments to be received. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 97 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_97&doctype=Standard -URIDate 2020-01-01 + Details
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