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Equity - Adjustments of Additional Paid-in Capital (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Beginning balance $ 392,719   $ 391,529 $ 389,130
Unclaimed dividend 2   2 2
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method     (26)  
Ending balance 395,806 $ 12,071 392,719 391,529
Share premium [Member]        
Beginning balance 126,045   126,045 126,045
Unclaimed dividend 0   0 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries     0  
Actual acquisition of interests in subsidiaries     0  
Actual disposal of interests in subsidiaries 0      
Changes in equities of subsidiaries 0   0 0
Ending balance 126,045   126,045 126,045
Movements Of Additional Paid-in Capital For Associates And Joint Ventures Accounted For Using Equity Method        
Beginning balance (25)   1 1
Unclaimed dividend 0   0 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries     (26)  
Actual acquisition of interests in subsidiaries     0  
Actual disposal of interests in subsidiaries 0      
Changes in equities of subsidiaries 0   0 0
Ending balance (25)   (25) 1
Movements of additional paid-in capital arising from changes in equities of subsidiaries [Member]        
Beginning balance 2,146   2,138 2,106
Unclaimed dividend 0   0 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries     0  
Actual acquisition of interests in subsidiaries     0  
Actual disposal of interests in subsidiaries 0      
Changes in equities of subsidiaries 0   8 32
Ending balance 2,146   2,146 2,138
Difference between consideration received or paid and carrying amount of subsidiaries net assets during actual disposal or acquisition [Member]        
Beginning balance 987   987 987
Unclaimed dividend 0   0 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries     0  
Actual acquisition of interests in subsidiaries     0  
Actual disposal of interests in subsidiaries 224      
Changes in equities of subsidiaries 0   0 0
Ending balance 1,211   987 987
Donated capital [Member]        
Beginning balance 27   25 23
Unclaimed dividend 2   2 2
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries     0  
Actual acquisition of interests in subsidiaries     0  
Actual disposal of interests in subsidiaries 0      
Changes in equities of subsidiaries 0   0 0
Ending balance 29   27 25
Stockholders' contribution due to privatization [Member]        
Beginning balance 20,648   20,648 20,648
Unclaimed dividend 0   0 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries     0  
Actual acquisition of interests in subsidiaries     0  
Actual disposal of interests in subsidiaries 0      
Changes in equities of subsidiaries 0   0 0
Ending balance 20,648   20,648 20,648
Additional paid-in capital [Member]        
Beginning balance 149,828   149,844 149,810
Unclaimed dividend 2   2 2
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method     (26)  
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries     (26)  
Actual acquisition of interests in subsidiaries     0  
Actual disposal of interests in subsidiaries 224      
Changes in equities of subsidiaries 0   8 32
Ending balance $ 150,054 $ 4,576 $ 149,828 $ 149,844