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Equity - Adjustments of Additional Paid-in Capital (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Beginning balance $ 369,410   $ 366,928 $ 369,339
Partial disposal of interests in subsidiaries 1,175   106 83
Unclaimed dividend 2   3  
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method     0  
Change in additional paid-in capital for not participating proportionately in the capital increase of a subsidiary 1,477   2,552 1,175
Other changes in additional paid-in capital of subsidiaries     0  
Share-based payment transactions of subsidiaries 53   22 17
Ending balance 384,529 $ 12,562 369,410 366,928
Share premium [Member]        
Beginning balance 126,045   126,045 126,045
Partial disposal of interests in subsidiaries 0   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        
Partial disposal of interests in subsidiaries 0   0 0
Other changes in additional paid-in capital of subsidiaries     0  
Share-based payment transactions of subsidiaries 0   0 0
Movements of additional paid-in capital arising from changes in equities of subsidiaries [Member]        
Beginning balance 1,221   389 0
Partial disposal of interests in subsidiaries 0   1 0
Change in additional paid-in capital for not participating proportionately in the capital increase of a subsidiary 777   802 389
Other changes in additional paid-in capital of subsidiaries     0  
Share-based payment transactions of subsidiaries 11   2 0
Treasury stock transfer of subsidiaries 55   27  
Ending balance 2,064   1,221 389
Difference between consideration received and carrying amount of the subsidiaries' net assets upon disposal [Member]        
Beginning balance 161   85 27
Partial disposal of interests in subsidiaries 826   76 58
Other changes in additional paid-in capital of subsidiaries     0  
Share-based payment transactions of subsidiaries 0   0 0
Ending balance 987   161 85
Donated capital [Member]        
Beginning balance 16   13 13
Partial disposal of interests in subsidiaries 0   0 0
Unclaimed dividend 2   3  
Other changes in additional paid-in capital of subsidiaries     0  
Share-based payment transactions of subsidiaries 0   0 0
Ending balance 18   16 13
Stockholders' contribution due to privatization [Member]        
Beginning balance 20,648   20,648 20,648
Partial disposal of interests in subsidiaries 0   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 148,091   147,180 146,733
Partial disposal of interests in subsidiaries 826   77 58
Unclaimed dividend 2   3  
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method     0  
Change in additional paid-in capital for not participating proportionately in the capital increase of a subsidiary 777   802 389
Other changes in additional paid-in capital of subsidiaries     0  
Share-based payment transactions of subsidiaries 11   2 0
Treasury stock transfer of subsidiaries 55   27  
Ending balance $ 149,762 $ 4,893 $ 148,091 $ 147,180