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Lease Arrangements - Summary of Right-of-use Assets (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2023
USD ($)
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]        
Right-of-use assets $ 11,238 $ 11,103   $ 367
Additions to right-of-use assets 4,415 4,369 $ 4,669  
Depreciation charge for right-of-use assets        
Depreciation, right-of-use assets 4,072 3,982 3,985  
Handsets Base Stations [Member]        
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]        
Right-of-use assets 7,577 7,175    
Depreciation charge for right-of-use assets        
Depreciation, right-of-use assets 2,939 2,863 2,789  
Others [Member]        
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]        
Right-of-use assets 1,754 1,727    
Depreciation charge for right-of-use assets        
Depreciation, right-of-use assets 787 770 786  
Equipment [Member]        
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]        
Right-of-use assets 1,907 2,201    
Depreciation charge for right-of-use assets        
Depreciation, right-of-use assets $ 346 $ 349 $ 410