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Equity - Noncontrolling Interests (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
Effect of retrospective application of IFRS 9     883  
Profit Allocated to Noncontrolling Interests 1,024 $ 33 1,172 1,141
Unrealized gain or loss on available-for-sale financial assets     605 (721)
Income tax relating to unrealized gain and loss on available-for-sale financial assets 0   (3) (2)
Income tax relating to remeasurements of defined benefit pension plans 243   344 347
Cash dividends distributed by subsidiaries (958)   (942) (710)
Partial disposal of interests in subsidiaries 1,175   106 83
Other changes in additional paid-in capital of subsidiaries     0  
Share-based payment transactions of subsidiaries 53   22 17
Net increase in noncontrolling interests 294   223 5
Ending balance 384,529 12,562 369,410 366,928
Noncontrolling interests [Member]        
Beginning balance 8,474   6,272 5,065
Effect of retrospective application of IFRS 9 (4)   0 0
Profit Allocated to Noncontrolling Interests 1,024   1,172 1,141
Exchange differences arising from the translation of the net investment in foreign operations (3)   (12) (41)
Unrealized gain or loss on financial assets at FVOCI (1)   0 0
Unrealized gain or loss on available-for-sale financial assets 0   (2) 0
Income tax relating to unrealized gain and loss on available-for-sale financial assets 0   1 0
Remeasurements of defined benefit pension plans (9)   (8) (18)
Income tax relating to remeasurements of defined benefit pension plans 3   0 3
Share of other comprehensive income or loss of associates accounted for using equity method 1   (2) (1)
Cash dividends distributed by subsidiaries (958)   (942) (710)
Partial disposal of interests in subsidiaries 349   29 25
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries 700   1,750 786
Other changes in additional paid-in capital of subsidiaries     0  
Share-based payment transactions of subsidiaries 42   20 17
Net increase in noncontrolling interests 239   196 5
Ending balance 9,857 $ 322 8,474 6,272
As Adjusted [Member] | Noncontrolling interests [Member]        
Beginning balance $ 8,470   6,272 5,065
Ending balance     $ 8,470 $ 6,272