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v3.19.1

Equity - Adjustments of Additional Paid-in Capital (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
Partial disposal of interests in subsidiaries | 1,175 |  | 106 | 83
Unclaimed dividend | 2 |  | 3 |
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method |  |  | 0 |
Change in additional paid-in capital for not participating proportionately in the capital increase of a subsidiary | 1,477 |  | 2,552 | 1,175
Other changes in additional paid-in capital of subsidiaries |  |  | 0 |
Share-based payment transactions of subsidiaries | 53 |  | 22 | 17
Ending balance | 384,529 | $ 12,562 | 369,410 | 366,928
Share premium [Member] |  |  |  |
Beginning balance | 126,045 |  | 126,045 | 126,045
Partial disposal of interests in subsidiaries | 0 |  | 0 | 0
Other changes in additional paid-in capital of subsidiaries |  |  | 0 |
Share-based payment transactions of subsidiaries | 0 |  | 0 | 0
Ending balance | 126,045 |  | 126,045 | 126,045
Movements Of Additional Paidin Capital For Associates And Joint Ventures Accounted For Using Equity Method |  |  |  |
Partial disposal of interests in subsidiaries | 0 |  | 0 | 0
Other changes in additional paid-in capital of subsidiaries |  |  | 0 |
Share-based payment transactions of subsidiaries | 0 |  | 0 | 0
Movements of additional paid-in capital arising from changes in equities of subsidiaries [Member] |  |  |  |
Beginning balance | 1,221 |  | 389 | 0
Partial disposal of interests in subsidiaries | 0 |  | 1 | 0
Change in additional paid-in capital for not participating proportionately in the capital increase of a subsidiary | 777 |  | 802 | 389
Other changes in additional paid-in capital of subsidiaries |  |  | 0 |
Share-based payment transactions of subsidiaries | 11 |  | 2 | 0
Treasury stock transfer of subsidiaries | 55 |  | 27 |
Ending balance | 2,064 |  | 1,221 | 389
Difference between consideration received and carrying amount of the subsidiaries' net assets upon disposal [Member] |  |  |  |
Beginning balance | 161 |  | 85 | 27
Partial disposal of interests in subsidiaries | 826 |  | 76 | 58
Other changes in additional paid-in capital of subsidiaries |  |  | 0 |
Share-based payment transactions of subsidiaries | 0 |  | 0 | 0
Ending balance | 987 |  | 161 | 85
Donated capital [Member] |  |  |  |
Beginning balance | 16 |  | 13 | 13
Partial disposal of interests in subsidiaries | 0 |  | 0 | 0
Unclaimed dividend | 2 |  | 3 |
Other changes in additional paid-in capital of subsidiaries |  |  | 0 |
Share-based payment transactions of subsidiaries | 0 |  | 0 | 0
Ending balance | 18 |  | 16 | 13
Stockholders' contribution due to privatization [Member] |  |  |  |
Beginning balance | 20,648 |  | 20,648 | 20,648
Partial disposal of interests in subsidiaries | 0 |  | 0 | 0
Other changes in additional paid-in capital of subsidiaries |  |  | 0 |
Share-based payment transactions of subsidiaries | 0 |  | 0 | 0
Ending balance | 20,648 |  | 20,648 | 20,648
Additional paid-in capital [Member] |  |  |  |
Beginning balance | 148,091 |  | 147,180 | 146,733
Partial disposal of interests in subsidiaries | 826 |  | 77 | 58
Unclaimed dividend | 2 |  | 3 |
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method |  |  | 0 |
Change in additional paid-in capital for not participating proportionately in the capital increase of a subsidiary | 777 |  | 802 | 389
Other changes in additional paid-in capital of subsidiaries |  |  | 0 |
Share-based payment transactions of subsidiaries | 11 |  | 2 | 0
Treasury stock transfer of subsidiaries | 55 |  | 27 |
Ending balance | $ 149,762 | $ 4,893 | $ 148,091 | $ 147,180

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