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Lease Arrangements - Summary of Right-of-use Assets (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2021
USD ($)
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]        
Right-of-use assets $ 11,051 $ 11,009   $ 398
Additions to right-of-use assets 4,669 3,796 $ 3,803  
Depreciation charge for right-of-use assets        
Depreciation, right-of-use assets 3,985 3,931 3,968  
Handsets Base Stations [Member]        
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]        
Right-of-use assets 6,988 7,096    
Depreciation charge for right-of-use assets        
Depreciation, right-of-use assets 2,789 2,729 2,728  
Others [Member]        
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]        
Right-of-use assets 1,538 1,708    
Depreciation charge for right-of-use assets        
Depreciation, right-of-use assets 786 786 821  
Equipment [Member]        
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]        
Right-of-use assets 2,525 2,205    
Depreciation charge for right-of-use assets        
Depreciation, right-of-use assets $ 410 $ 416 $ 419