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Equity - Adjustments of Additional Paid-in Capital (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Beginning balance $ 384,272   $ 384,529 $ 382,124
Unclaimed dividend 2   1 2
Partial disposal of interests in subsidiaries       1,175
Change in additional paid-in capital for not participating proportionately in the capital increase of subsidiaries 0     1,477
Share-based payment transactions of subsidiaries 89   21 53
Ending balance 387,273 $ 13,791 384,272 384,529
Share premium [Member]        
Beginning balance 126,045   126,045 126,045
Partial disposal of interests in subsidiaries       0
Share-based payment transactions 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 0   0 0
Partial disposal of interests in subsidiaries       0
Share-based payment transactions of subsidiaries 0   0 0
Ending balance 0   0 0
Movements of additional paid-in capital arising from changes in equities of subsidiaries [Member]        
Beginning balance 2,063   2,064 1,221
Partial disposal of interests in subsidiaries       0
Change in additional paid-in capital for not participating proportionately in the capital increase of subsidiaries 0     777
Share-based payment transactions of subsidiaries 26   (1) 11
Treasury stock transfer of subsidiaries       55
Ending balance 2,089   2,063 2,064
Difference between consideration received and carrying amount of the subsidiaries' net assets upon disposal [Member]        
Beginning balance 987   987 161
Partial disposal of interests in subsidiaries       826
Share-based payment transactions of subsidiaries 0   0 0
Ending balance 987   987 987
Donated capital [Member]        
Beginning balance 19   18 16
Unclaimed dividend 2   1 2
Partial disposal of interests in subsidiaries       0
Share-based payment transactions of subsidiaries 0   0 0
Ending balance 21   19 18
Stockholders' contribution due to privatization [Member]        
Beginning balance 20,648   20,648 20,648
Partial disposal of interests in subsidiaries       0
Share-based payment transactions of subsidiaries 0   0 0
Ending balance 20,648   20,648 20,648
Additional paid-in capital [Member]        
Beginning balance 149,762   149,762 148,091
Unclaimed dividend 2   1 2
Partial disposal of interests in subsidiaries       826
Change in additional paid-in capital for not participating proportionately in the capital increase of subsidiaries 0     777
Share-based payment transactions of subsidiaries 26   (1) 11
Treasury stock transfer of subsidiaries       55
Ending balance $ 149,790 $ 5,334 $ 149,762 $ 149,762