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Equity - Adjustments of Additional Paid-in Capital (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Beginning balance $ 384,529   $ 369,410 $ 366,928
Unclaimed dividend 1   2 3
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method       0
Partial disposal of interests in subsidiaries     1,175 106
Change in additional paid-in capital for not participating proportionately in the capital increase of subsidiaries     1,477 2,552
Other changes in additional paid-in capital of subsidiaries       0
Share-based payment transactions of subsidiaries 21   53 22
Ending balance 384,272 $ 12,848 384,529 369,410
Share premium [Member]        
Beginning balance 126,045   126,045 126,045
Partial disposal of interests in subsidiaries     0 0
Other changes in additional paid-in capital of subsidiaries       0
Share-based payment transactions of subsidiaries 0   0 0
Ending balance 126,045   126,045 126,045
Movements Of Additional Paidin Capital For Associates And Joint Ventures Accounted For Using Equity Method        
Beginning balance     0 0
Partial disposal of interests in subsidiaries     0 0
Other changes in additional paid-in capital of subsidiaries       0
Share-based payment transactions of subsidiaries 0   0 0
Ending balance       0
Movements of additional paid-in capital arising from changes in equities of subsidiaries [Member]        
Beginning balance 2,064   1,221 389
Partial disposal of interests in subsidiaries     0 1
Change in additional paid-in capital for not participating proportionately in the capital increase of subsidiaries     777 802
Other changes in additional paid-in capital of subsidiaries       0
Share-based payment transactions of subsidiaries (1)   11 2
Treasury stock transfer of subsidiaries     55 27
Ending balance 2,063   2,064 1,221
Difference between consideration received and carrying amount of the subsidiaries' net assets upon disposal [Member]        
Beginning balance 987   161 85
Partial disposal of interests in subsidiaries     826 76
Other changes in additional paid-in capital of subsidiaries       0
Share-based payment transactions of subsidiaries 0   0 0
Ending balance 987   987 161
Donated capital [Member]        
Beginning balance 18   16 13
Unclaimed dividend 1   2 3
Partial disposal of interests in subsidiaries     0 0
Other changes in additional paid-in capital of subsidiaries       0
Share-based payment transactions of subsidiaries 0   0 0
Ending balance 19   18 16
Stockholders' contribution due to privatization [Member]        
Beginning balance 20,648   20,648 20,648
Partial disposal of interests in subsidiaries     0 0
Other changes in additional paid-in capital of 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   148,091 147,180
Unclaimed dividend 1   2 3
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method       0
Partial disposal of interests in subsidiaries     826 77
Change in additional paid-in capital for not participating proportionately in the capital increase of subsidiaries     777 802
Other changes in additional paid-in capital of subsidiaries       0
Share-based payment transactions of subsidiaries (1)   11 2
Treasury stock transfer of subsidiaries     55 27
Ending balance $ 149,762 $ 5,007 $ 149,762 $ 148,091