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Investment Properties - Schedule of Future Aggregate Lease Collection Under Operating Lease for Investment Properties (Detail) - TWD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]
Aggregate lease collection under operating lease	$ 423	$ 434
Year 1 [Member]
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]
Aggregate lease collection under operating lease	107	115
Year 2 [Member]
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]
Aggregate lease collection under operating lease	82	95
Year 3 [Member]
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]
Aggregate lease collection under operating lease	62	75
Year 4 [Member]
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]
Aggregate lease collection under operating lease	55	53
Year 5 [Member]
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]
Aggregate lease collection under operating lease	39	38
Onwards [Member]
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]
Aggregate lease collection under operating lease	$ 78	$ 58

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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No definition available.

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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 2021-01-01
-Paragraph 97
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-URIDate 2021-03-24

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