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Equity - Adjustments of Additional Paid-in Capital (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Beginning balance | $ 391,529 |  | $ 389,130 | $ 387,273
Unclaimed dividend | 2 |  | 2 | 2
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method | (26) |  |  | 1
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries |  |  | 15 |
Share-based payment transactions of subsidiaries | 33 |  | 89 | 73
Ending balance | 392,719 | $ 12,826 | 391,529 | 389,130
Share premium [Member] |  |  |  |
Beginning balance | 126,045 |  | 126,045 | 126,045
Unclaimed dividend | 0 |  | 0 | 0
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 proportionately participating in the capital increase of subsidiaries | 0 |  | 0 |
Actual acquisition of interests in subsidiaries | 0 |  |  |
Share-based payment transactions 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 | 1 |  | 1 | 0
Unclaimed dividend | 0 |  | 0 | 0
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method |  |  |  | 1
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries | (26) |  | 0 |
Actual acquisition of interests in subsidiaries | 0 |  |  |
Share-based payment transactions of subsidiaries | 0 |  | 0 | 0
Ending balance | (25) |  | 1 | 1
Movements of additional paid-in capital arising from changes in equities of subsidiaries [Member] |  |  |  |
Beginning balance | 2,138 |  | 2,106 | 2,089
Unclaimed dividend | 0 |  | 0 | 0
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 proportionately participating in the capital increase of subsidiaries | 0 |  | 5 |
Actual acquisition of interests in subsidiaries | 0 |  |  |
Share-based payment transactions of subsidiaries | 8 |  | 27 | 17
Ending balance | 2,146 |  | 2,138 | 2,106
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 from investments in associates and joint ventures accounted for using equity method |  |  |  | 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries | 0 |  | 0 |
Actual acquisition of interests in subsidiaries | 0 |  |  |
Share-based payment transactions of subsidiaries | 0 |  | 0 | 0
Ending balance | 987 |  | 987 | 987
Donated capital [Member] |  |  |  |
Beginning balance | 25 |  | 23 | 21
Unclaimed dividend | 2 |  | 2 | 2
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 proportionately participating in the capital increase of subsidiaries | 0 |  | 0 |
Actual acquisition of interests in subsidiaries | 0 |  |  |
Share-based payment transactions of subsidiaries | 0 |  | 0 | 0
Ending balance | 27 |  | 25 | 23
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 from investments in associates and joint ventures accounted for using equity method |  |  |  | 0
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries | 0 |  | 0 |
Actual acquisition of interests in 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 | 149,844 |  | 149,810 | 149,790
Unclaimed dividend | 2 |  | 2 | 2
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method | (26) |  |  | 1
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries | (26) |  | 5 |
Actual acquisition of interests in subsidiaries | 0 |  |  |
Share-based payment transactions of subsidiaries | 8 |  | 27 | 17
Ending balance | $ 149,828 | $ 4,893 | $ 149,844 | $ 149,810

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