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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, 2019 | Dec. 31, 2018
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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 | $ 471 | $ 1,130
Year 1 [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 113 | 344
Year 2 [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 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 | 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 | 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 | 39 |
Onwards [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Future aggregate lease collection under operating lease for freehold plant, property and equipment | 96 | $ 206
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 | 2,354 |
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 | 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 | 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 | 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 | 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 | 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 | $ 1,224 |

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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 2019-01-01 -Paragraph 97 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_97&doctype=Standard -URIDate 2019-03-27 + Details
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