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Equity - Adjustments of Additional Paid-in Capital (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Beginning balance | $ 384,529 |  | $ 369,410 | $ 366,928
Unclaimed dividend | 1 |  | 2 | 3
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method |  |  |  | 0
Partial disposal of interests in subsidiaries |  |  | 1,175 | 106
Change in additional paid-in capital for not participating proportionately in the capital increase of subsidiaries |  |  | 1,477 | 2,552
Other changes in additional paid-in capital of subsidiaries |  |  |  | 0
Share-based payment transactions of subsidiaries | 21 |  | 53 | 22
Ending balance | 384,272 | $ 12,848 | 384,529 | 369,410
Share premium [Member] |  |  |  |
Beginning balance | 126,045 |  | 126,045 | 126,045
Partial disposal of interests in subsidiaries |  |  | 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 |  |  |  |
Beginning balance |  |  | 0 | 0
Partial disposal of interests in subsidiaries |  |  | 0 | 0
Other changes in additional paid-in capital of subsidiaries |  |  |  | 0
Share-based payment transactions of subsidiaries | 0 |  | 0 | 0
Ending balance |  |  |  | 0
Movements of additional paid-in capital arising from changes in equities of subsidiaries [Member] |  |  |  |
Beginning balance | 2,064 |  | 1,221 | 389
Partial disposal of interests in subsidiaries |  |  | 0 | 1
Change in additional paid-in capital for not participating proportionately in the capital increase of subsidiaries |  |  | 777 | 802
Other changes in additional paid-in capital of subsidiaries |  |  |  | 0
Share-based payment transactions of subsidiaries | (1) |  | 11 | 2
Treasury stock transfer of subsidiaries |  |  | 55 | 27
Ending balance | 2,063 |  | 2,064 | 1,221
Difference between consideration received and carrying amount of the subsidiaries' net assets upon disposal [Member] |  |  |  |
Beginning balance | 987 |  | 161 | 85
Partial disposal of interests in subsidiaries |  |  | 826 | 76
Other changes in additional paid-in capital of subsidiaries |  |  |  | 0
Share-based payment transactions of subsidiaries | 0 |  | 0 | 0
Ending balance | 987 |  | 987 | 161
Donated capital [Member] |  |  |  |
Beginning balance | 18 |  | 16 | 13
Unclaimed dividend | 1 |  | 2 | 3
Partial disposal of interests in subsidiaries |  |  | 0 | 0
Other changes in additional paid-in capital of subsidiaries |  |  |  | 0
Share-based payment transactions of subsidiaries | 0 |  | 0 | 0
Ending balance | 19 |  | 18 | 16
Stockholders' contribution due to privatization [Member] |  |  |  |
Beginning balance | 20,648 |  | 20,648 | 20,648
Partial disposal of interests in subsidiaries |  |  | 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 | 149,762 |  | 148,091 | 147,180
Unclaimed dividend | 1 |  | 2 | 3
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method |  |  |  | 0
Partial disposal of interests in subsidiaries |  |  | 826 | 77
Change in additional paid-in capital for not participating proportionately in the capital increase of subsidiaries |  |  | 777 | 802
Other changes in additional paid-in capital of subsidiaries |  |  |  | 0
Share-based payment transactions of subsidiaries | (1) |  | 11 | 2
Treasury stock transfer of subsidiaries |  |  | 55 | 27
Ending balance | $ 149,762 | $ 5,007 | $ 149,762 | $ 148,091

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