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Equity - Noncontrolling Interests (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Jan. 01, 2019 TWD ($) | Jan. 01, 2018 TWD ($)
Beginning balance | $ 384,529 |  | $ 369,410 | $ 366,928 |  |
Effect of retrospective application of IFRS 9, 15 and 16 |  |  |  |  | $ 0 | $ 883
Profit Allocated to Noncontrolling Interests | 974 | $ 32 | 1,024 | 1,172 |  |
Unrealized gain or loss on available-for-sale financial assets |  |  |  | 605 |  |
Income tax relating to unrealized gain and loss on available-for-sale financial assets | 0 |  | 0 | (3) |  |
Income tax relating to remeasurements of defined benefit pension plans | (305) |  | 243 | 344 |  |
Cash dividends distributed by subsidiaries | (710) |  | (958) | (942) |  |
Partial disposal of interests in subsidiaries |  |  | 1,175 | 106 |  |
Share-based payment transactions of subsidiaries | 21 |  | 53 | 22 |  |
Other changes in additional paid-in capital of subsidiaries |  |  |  | 0 |  |
Net increase (decrease) in noncontrolling interests | (1) |  | 294 | 223 |  |
Ending balance | 384,272 | 12,848 | 384,529 | 369,410 |  |
Noncontrolling interests [Member] |  |  |  |  |  |
Beginning balance | 9,857 |  | 8,474 | 6,272 |  |
Effect of retrospective application of IFRS 9, 15 and 16 | (20) |  | (4) | 0 |  |
Profit Allocated to Noncontrolling Interests | 974 |  | 1,024 | 1,172 |  |
Exchange differences arising from the translation of the net investment in foreign operations | 8 |  | (3) | (12) |  |
Unrealized gain or loss on financial assets at FVOCI | (26) |  | (1) | 0 |  |
Unrealized gain or loss on available-for-sale financial assets | 0 |  | 0 | (2) |  |
Income tax relating to unrealized gain and loss on available-for-sale financial assets | 0 |  | 0 | 1 |  |
Remeasurements of defined benefit pension plans | 15 |  | (9) | (8) |  |
Income tax relating to remeasurements of defined benefit pension plans | (3) |  | 3 | 0 |  |
Share of other comprehensive income (loss) of associates accounted for using equity method | (1) |  | 1 | (2) |  |
Cash dividends distributed by subsidiaries | (710) |  | (958) | (942) |  |
Partial disposal of interests in subsidiaries | 0 |  | 349 | 29 |  |
Share-based payment transactions of subsidiaries | 22 |  | 42 | 20 |  |
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries | 0 |  | 700 | 1,750 |  |
Other changes in additional paid-in capital of subsidiaries | 0 |  | 0 | 0 |  |
Net increase (decrease) in noncontrolling interests | (1) |  | 239 | 196 |  |
Ending balance | 10,115 | $ 338 | 9,857 | 8,474 |  |
As Adjusted [Member] | Noncontrolling interests [Member] |  |  |  |  |  |
Beginning balance | $ 9,837 |  | 8,470 | 6,272 |  |
Ending balance |  |  | $ 9,837 | $ 8,470 |  |

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