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Subsidiaries - Detailed Information of Equity Transactions (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
CHIEF Share-Based Payment [Member]      
Disclosure Of Classes Of Share Capital [Line Items]      
Cash consideration received from noncontrolling interests $ 14 $ 8 $ 39
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests (10) (2) (17)
Differences arising from equity transactions 4 6 22
Additional paid-in capital arising from the difference between the consideration received or paid and the carrying amount of the subsidiaries net assets during actual disposal or acquisition 0 0  
Additional paid-in capital - arising from changes in equities of subsidiaries 4 6 22
CHTSC Share-Based Payment [Member]      
Disclosure Of Classes Of Share Capital [Line Items]      
Cash consideration received from noncontrolling interests 14 15 35
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests (14) (13) (30)
Differences arising from equity transactions 0 2 5
Additional paid-in capital arising from the difference between the consideration received or paid and the carrying amount of the subsidiaries net assets during actual disposal or acquisition 0 0  
Additional paid-in capital - arising from changes in equities of subsidiaries 0 2 5
Chunghwa Not Proportionately Participating in the Capital Increase of CHST[Member]      
Disclosure Of Classes Of Share Capital [Line Items]      
Cash consideration received from noncontrolling interests     15
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests     (10)
Differences arising from equity transactions     5
Additional paid-in capital - arising from changes in equities of subsidiaries     $ 5
CLPT Share Based Payment [Member]      
Disclosure Of Classes Of Share Capital [Line Items]      
Cash consideration received from noncontrolling interests 9 1  
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests (13) (1)  
Differences arising from equity transactions (4) 0  
Additional paid-in capital arising from the difference between the consideration received or paid and the carrying amount of the subsidiaries net assets during actual disposal or acquisition 0 0  
Additional paid-in capital - arising from changes in equities of subsidiaries (4) 0  
Purchasing UTC Shares [Member]      
Disclosure Of Classes Of Share Capital [Line Items]      
Cash consideration received from noncontrolling interests   0  
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests   0  
Differences arising from equity transactions   0  
Additional paid-in capital arising from the difference between the consideration received or paid and the carrying amount of the subsidiaries net assets during actual disposal or acquisition   0  
Additional paid-in capital - arising from changes in equities of subsidiaries   $ 0  
Disposal of CHTSC Shares [Member]      
Disclosure Of Classes Of Share Capital [Line Items]      
Cash consideration received from noncontrolling interests 207    
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests (19)    
Differences arising from equity transactions 188    
Additional paid-in capital arising from the difference between the consideration received or paid and the carrying amount of the subsidiaries net assets during actual disposal or acquisition 188    
Additional paid-in capital - arising from changes in equities of subsidiaries 0    
Disposal of IISI Shares [Member]      
Disclosure Of Classes Of Share Capital [Line Items]      
Cash consideration received from noncontrolling interests 52    
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests (16)    
Differences arising from equity transactions 36    
Additional paid-in capital arising from the difference between the consideration received or paid and the carrying amount of the subsidiaries net assets during actual disposal or acquisition 36    
Additional paid-in capital - arising from changes in equities of subsidiaries $ 0