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Investment Properties - Schedule of Future Aggregate Lease Collection Under Operating Lease for Investment Properties (Detail) - TWD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]    
Aggregate lease collection under operating lease $ 1,082 $ 570
Year 1 [Member]    
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]    
Aggregate lease collection under operating lease 168 118
Year 2 [Member]    
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]    
Aggregate lease collection under operating lease 157 99
Year 3 [Member]    
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]    
Aggregate lease collection under operating lease 134 90
Year 4 [Member]    
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]    
Aggregate lease collection under operating lease 105 70
Year 5 [Member]    
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]    
Aggregate lease collection under operating lease 83 44
Onwards [Member]    
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]    
Aggregate lease collection under operating lease $ 435 $ 149