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Property, Plant and Equipment - Summary of Property, Plant and Equipment - Assets Subject to Operating Leases (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance $ 281,416      
Depreciation expenses (27,805)   $ (26,989) $ (26,930)
Additions 35,613   25,195 23,164
Impairment losses 0 $ 0 0 93
Ending balance 289,100 $ 10,423 281,416  
Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 7,593   7,324  
Ending balance 7,251   7,593 7,324
As Adjusted [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance       5,935
Gross carrying amount [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 9,209   8,821 7,201
Additions       4
Transferred from (to) assets used by the Company       1,616
Others (266)   388  
Ending balance 8,943   9,209 8,821
Accumulated depreciation, amortization and impairment [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance (1,616)   (1,497) (1,266)
Depreciation expenses (77)   (82) (74)
Transferred from (to) assets used by the Company       (157)
Others 1   (37)  
Ending balance (1,692)   (1,616) (1,497)
Land [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 4,973   4,979  
Ending balance 4,809   4,973 4,979
Land [Member] | As Adjusted [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance       3,617
Land [Member] | Gross carrying amount [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 4,973   4,979 3,617
Additions       0
Transferred from (to) assets used by the Company       1,362
Others (164)   (6)  
Ending balance 4,809   4,973 4,979
Land [Member] | Accumulated depreciation, amortization and impairment [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 0   0 0
Depreciation expenses 0   0 0
Transferred from (to) assets used by the Company       0
Others 0   0  
Ending balance 0   0 0
Land improvements [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 0   0  
Ending balance 0   0 0
Land improvements [Member] | As Adjusted [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance       0
Land improvements [Member] | Gross carrying amount [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 0   0 1
Additions       0
Transferred from (to) assets used by the Company       (1)
Others 0   0  
Ending balance 0   0 0
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 0   0 (1)
Depreciation expenses 0   0 0
Transferred from (to) assets used by the Company       1
Others 0   0  
Ending balance 0   0 0
Buildings [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 2,620   2,345  
Ending balance 2,442   2,620 2,345
Buildings [Member] | As Adjusted [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance       2,318
Buildings [Member] | Gross carrying amount [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 4,236   3,842 3,583
Additions       4
Transferred from (to) assets used by the Company       255
Others (102)   394  
Ending balance 4,134   4,236 3,842
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] | Property, plant and equipment subject to operating leases [member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance (1,616)   (1,497) (1,265)
Depreciation expenses (77)   (82) (74)
Transferred from (to) assets used by the Company       (158)
Others 1   (37)  
Ending balance $ (1,692)   $ (1,616) $ (1,497)