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Investment Properties - Schedule of Future Aggregate Lease Collection Under Operating Lease for Investment Properties (Detail) - TWD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | $ 434 | $ 471
Year 1 [Member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | 115 | 113
Year 2 [Member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | 95 | 91
Year 3 [Member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | 75 | 71
Year 4 [Member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | 53 | 61
Year 5 [Member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | 38 | 39
Onwards [Member] |  |
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items] |  |
Aggregate lease collection under operating lease | $ 58 | $ 96

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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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