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Lease Arrangements - Summary of Right-of-use Assets (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2024
USD ($)
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]        
Right-of-use assets $ 10,912 $ 11,238   $ 333
Additions to right-of-use assets 4,092 4,415 $ 4,369  
Depreciation charge for right-of-use assets        
Depreciation, right-of-use assets 4,168 4,072 3,982  
Handsets Base Stations [Member]        
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]        
Right-of-use assets 7,648 7,577    
Depreciation charge for right-of-use assets        
Depreciation, right-of-use assets 3,009 2,939 2,863  
Others [Member]        
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]        
Right-of-use assets 1,564 1,754    
Depreciation charge for right-of-use assets        
Depreciation, right-of-use assets 805 787 770  
Equipment [Member]        
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]        
Right-of-use assets 1,700 1,907    
Depreciation charge for right-of-use assets        
Depreciation, right-of-use assets $ 354 $ 346 $ 349