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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, 2021
Dec. 31, 2020
Disclosure Of Property Plant And Equipment [Line Items]    
Future aggregate lease collection under operating lease for freehold plant, property and equipment $ 423 $ 434
Year 1 [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Future aggregate lease collection under operating lease for freehold plant, property and equipment 107 115
Year 2 [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Future aggregate lease collection under operating lease for freehold plant, property and equipment 82 95
Year 3 [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Future aggregate lease collection under operating lease for freehold plant, property and equipment 62 75
Year 4 [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Future aggregate lease collection under operating lease for freehold plant, property and equipment 55 53
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 38
Onwards [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Future aggregate lease collection under operating lease for freehold plant, property and equipment 78 58
Property, plant and equipment 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 2,353 2,335
Property, plant and equipment 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 371 347
Property, plant and equipment 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 301 288
Property, plant and equipment 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 210 231
Property, plant and equipment 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 159 164
Property, plant and equipment 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 135 125
Property, plant and equipment 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 $ 1,177 $ 1,180