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Equity - Adjustments of Additional Paid-in Capital (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Beginning balance $ 366,928   $ 369,339 $ 365,712
Partial disposal of interests in subsidiaries 106   83 45
Unclaimed dividend 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 in the capital increase of a subsidiary 2,552   1,175  
Other changes in additional paid-in capital in subsidiaries 0     3
Subsidiary purchased its treasury stock       (492)
Share-based payment transactions of subsidiaries 22   17 36
Ending balance 369,410 $ 12,463 366,928 369,339
Share premium [Member]        
Beginning balance 126,045   126,045 126,045
Ending balance 126,045   126,045 126,045
Movements of additional paid-in capital arising from changes in equities of subsidiaries [Member]        
Beginning balance 389   0 14
Partial disposal of interests in subsidiaries 1   0 0
Change in additional paid-in capital for not participating in the capital increase of a subsidiary 802   389  
Other changes in additional paid-in capital in subsidiaries 0     1
Subsidiary purchased its treasury stock       (15)
Share-based payment transactions of subsidiaries 2   0  
Treasury stock transfer of subsidiaries 27      
Ending balance 1,221   389 0
Difference between consideration received and carrying amount of the subsidiaries' net assets upon disposal [Member]        
Beginning balance 85   27 0
Partial disposal of interests in subsidiaries 76   58 27
Ending balance 161   85 27
Donated capital [Member]        
Beginning balance 13   13 13
Unclaimed dividend 3      
Ending balance 16   13 13
Stockholders' contribution due to privatization [Member]        
Beginning balance 20,648   20,648 20,648
Ending balance 20,648   20,648 20,648
Additional paid-in capital [Member]        
Beginning balance 147,180   146,733 146,720
Partial disposal of interests in subsidiaries 77   58 27
Unclaimed dividend 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 in the capital increase of a subsidiary 802   389  
Other changes in additional paid-in capital in subsidiaries 0     1
Subsidiary purchased its treasury stock       (15)
Share-based payment transactions of subsidiaries 2   0 0
Treasury stock transfer of subsidiaries 27      
Ending balance $ 148,091 $ 4,996 $ 147,180 $ 146,733