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Equity - Adjustments of Additional Paid-in Capital (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Beginning balance $ 389,130   $ 387,273 $ 384,272
Unclaimed dividend 2   2 2
Share-based payment transactions of subsidiaries 89   73 89
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries 15     0
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method     1 (2)
Ending balance 391,529 $ 12,741 389,130 387,273
Share premium [Member]        
Beginning balance 126,045   126,045 126,045
Unclaimed dividend 0   0 0
Share-based payment transactions of subsidiaries 0   0 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries 0     0
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method     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 1   0 0
Unclaimed dividend 0   0 0
Share-based payment transactions of subsidiaries 0   0 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries 0     0
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method     1  
Ending balance 1   1 0
Movements of additional paid-in capital arising from changes in equities of subsidiaries [Member]        
Beginning balance 2,106   2,089 2,063
Unclaimed dividend 0   0 0
Share-based payment transactions of subsidiaries 27   17 26
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries 5     0
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method     0  
Ending balance 2,138   2,106 2,089
Difference between consideration received and carrying amount of the subsidiaries' net assets upon disposal [Member]        
Beginning balance 987   987 987
Unclaimed dividend 0   0 0
Share-based payment transactions of subsidiaries 0   0 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries 0     0
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method     0  
Ending balance 987   987 987
Donated capital [Member]        
Beginning balance 23   21 19
Unclaimed dividend 2   2 2
Share-based payment transactions of subsidiaries 0   0 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries 0     0
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method     0  
Ending balance 25   23 21
Stockholders' contribution due to privatization [Member]        
Beginning balance 20,648   20,648 20,648
Unclaimed dividend 0   0 0
Share-based payment transactions of subsidiaries 0   0 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries 0     0
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method     0  
Ending balance 20,648   20,648 20,648
Additional paid-in capital [Member]        
Beginning balance 149,810   149,790 149,762
Unclaimed dividend 2   2 2
Share-based payment transactions of subsidiaries 27   17 26
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries 5     0
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method     1 0
Ending balance $ 149,844 $ 4,876 $ 149,810 $ 149,790