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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

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