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Equity - Noncontrolling Interests (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
Profit Allocated to Noncontrolling Interests 1,172 $ 40 1,141 813
Unrealized gain (loss) on available-for-sale financial assets 605   (721) (671)
Income tax relating to unrealized gain and loss on available-for-sale financial assets (3)   (2) 2
Income tax relating to remeasurements of defined benefit pension plans 344   347 39
Cash dividends distributed by subsidiaries (942)   (710) (350)
Partial disposal of interests in subsidiaries 106   83 45
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 of subsidiaries 0     3
Share-based payment transactions of subsidiaries 22   17 36
Subsidiary purchased its treasury stock       (492)
Net increase in noncontrolling interests 223   5 39
Ending balance 369,410 12,463 366,928 369,339
Noncontrolling interests [Member]        
Beginning balance 6,272   5,065 4,924
Profit Allocated to Noncontrolling Interests 1,172   1,141 813
Exchange differences arising from the translation of the foreign operations (12)   (41) (3)
Unrealized gain (loss) on available-for-sale financial assets (2)   0 2
Income tax relating to unrealized gain and loss on available-for-sale financial assets 1   0 0
Remeasurements of defined benefit pension plans (8)   (18) (3)
Income tax relating to remeasurements of defined benefit pension plans 0   3 1
Share of other comprehensive income (loss) of associates accounted for using equity method (2)   (1) 2
Cash dividends distributed by subsidiaries (942)   (710) (350)
Partial disposal of interests in subsidiaries 29   25 18
Change in additional paid-in capital for not participating in the capital increase of a subsidiary 1,750   786 0
Other changes in additional paid-in capital of subsidiaries 0   0 2
Share-based payment transactions of subsidiaries 20   17 36
Subsidiary purchased its treasury stock 0   0 (416)
Net increase in noncontrolling interests 196   5 39
Ending balance $ 8,474 $ 286 $ 6,272 $ 5,065