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Equity - Adjustments of Additional Paid-in Capital (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Beginning balance | $ 392,719 |  | $ 391,529 | $ 389,130
Unclaimed dividend | 2 |  | 2 | 2
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method |  |  | (26) |
Ending balance | 395,806 | $ 12,071 | 392,719 | 391,529
Share premium [Member] |  |  |  |
Beginning balance | 126,045 |  | 126,045 | 126,045
Unclaimed dividend | 0 |  | 0 | 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries |  |  | 0 |
Actual acquisition of interests in subsidiaries |  |  | 0 |
Actual disposal of interests in subsidiaries | 0 |  |  |
Changes in equities of subsidiaries | 0 |  | 0 | 0
Ending balance | 126,045 |  | 126,045 | 126,045
Movements Of Additional Paid-in Capital For Associates And Joint Ventures Accounted For Using Equity Method |  |  |  |
Beginning balance | (25) |  | 1 | 1
Unclaimed dividend | 0 |  | 0 | 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries |  |  | (26) |
Actual acquisition of interests in subsidiaries |  |  | 0 |
Actual disposal of interests in subsidiaries | 0 |  |  |
Changes in equities of subsidiaries | 0 |  | 0 | 0
Ending balance | (25) |  | (25) | 1
Movements of additional paid-in capital arising from changes in equities of subsidiaries [Member] |  |  |  |
Beginning balance | 2,146 |  | 2,138 | 2,106
Unclaimed dividend | 0 |  | 0 | 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries |  |  | 0 |
Actual acquisition of interests in subsidiaries |  |  | 0 |
Actual disposal of interests in subsidiaries | 0 |  |  |
Changes in equities of subsidiaries | 0 |  | 8 | 32
Ending balance | 2,146 |  | 2,146 | 2,138
Difference between consideration received or paid and carrying amount of subsidiaries net assets during actual disposal or acquisition [Member] |  |  |  |
Beginning balance | 987 |  | 987 | 987
Unclaimed dividend | 0 |  | 0 | 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries |  |  | 0 |
Actual acquisition of interests in subsidiaries |  |  | 0 |
Actual disposal of interests in subsidiaries | 224 |  |  |
Changes in equities of subsidiaries | 0 |  | 0 | 0
Ending balance | 1,211 |  | 987 | 987
Donated capital [Member] |  |  |  |
Beginning balance | 27 |  | 25 | 23
Unclaimed dividend | 2 |  | 2 | 2
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries |  |  | 0 |
Actual acquisition of interests in subsidiaries |  |  | 0 |
Actual disposal of interests in subsidiaries | 0 |  |  |
Changes in equities of subsidiaries | 0 |  | 0 | 0
Ending balance | 29 |  | 27 | 25
Stockholders' contribution due to privatization [Member] |  |  |  |
Beginning balance | 20,648 |  | 20,648 | 20,648
Unclaimed dividend | 0 |  | 0 | 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries |  |  | 0 |
Actual acquisition of interests in subsidiaries |  |  | 0 |
Actual disposal of interests in subsidiaries | 0 |  |  |
Changes in equities of subsidiaries | 0 |  | 0 | 0
Ending balance | 20,648 |  | 20,648 | 20,648
Additional paid-in capital [Member] |  |  |  |
Beginning balance | 149,828 |  | 149,844 | 149,810
Unclaimed dividend | 2 |  | 2 | 2
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method |  |  | (26) |
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries |  |  | (26) |
Actual acquisition of interests in subsidiaries |  |  | 0 |
Actual disposal of interests in subsidiaries | 224 |  |  |
Changes in equities of subsidiaries | 0 |  | 8 | 32
Ending balance | $ 150,054 | $ 4,576 | $ 149,828 | $ 149,844

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