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Equity - Noncontrolling Interests (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
Beginning balance | $ 384,272 |  | $ 384,529 | $ 382,124
Profit Allocated to Noncontrolling Interests | 1,285 | $ 46 | 974 | 1,024
Income tax relating to remeasurements of defined benefit pension plans | (239) |  | (305) | 243
Cash dividends distributed by subsidiaries | (775) |  | (710) | (958)
Partial disposal of interests in subsidiaries |  |  |  | 1,175
Share-based payment transactions of subsidiaries | 89 |  | 21 | 53
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method | (2) |  |  |
Net increase (decrease) in noncontrolling interests | 476 |  | (1) | 294
Ending balance | 387,273 | 13,791 | 384,272 | 384,529
Noncontrolling interests [Member] |  |  |  |
Beginning balance | 10,115 |  | 9,857 | 8,470
Effect of retrospective application of IFRS 16 |  |  | (20) |
Profit Allocated to Noncontrolling Interests | 1,285 |  | 974 | 1,024
Exchange differences arising from the translation of the net investment in foreign operations | (14) |  | 8 | (3)
Unrealized gain or loss on financial assets at FVOCI | (3) |  | (26) | (1)
Remeasurements of defined benefit pension plans | 17 |  | 15 | (9)
Income tax relating to remeasurements of defined benefit pension plans | (3) |  | (3) | 3
Share of other comprehensive income (loss) of associates and joint ventures accounted for using equity method | (1) |  | (1) | 1
Cash dividends distributed by subsidiaries | (775) |  | (710) | (958)
Partial disposal of interests in subsidiaries | 0 |  | 0 | 349
Share-based payment transactions of subsidiaries | 63 |  | 22 | 42
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries | 0 |  | 0 | 700
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method | (2) |  | 0 | 0
Other changes in additional paid-in capital of subsidiaries | 0 |  | 0 | 0
Net increase (decrease) in noncontrolling interests | 476 |  | (1) | 239
Ending balance | 11,158 | $ 397 | 10,115 | 9,857
As Adjusted [Member] | Noncontrolling interests [Member] |  |  |  |
Beginning balance | $ 10,115 |  | 9,837 | 8,470
Ending balance |  |  | $ 10,115 | $ 9,837

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