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Equity (Tables) | 12 Months Ended
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Dec. 31, 2023
Disclosure Of Classes Of Share Capital [Line Items] |
Summary of Common Stocks | 1) Common stocks
|  | December 31 |
|  | 2022 |  |  | 2023 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Number of authorized shares |  |  | 12,000 |  |  |  | 12,000 |
Authorized shares |  | $ | 120,000 |  |  | $ | 120,000 |
Number of issued and paid shares |  |  | 7,757 |  |  |  | 7,757 |
Issued and outstanding shares |  | $ | 77,574 |  |  | $ | 77,574 |
Adjustments of Additional Paid-in Capital | The adjustments of additional paid-in capital for the years ended December 31, 2021, 2022 and 2023 were as follows:
|  | Share Premium |  |  | Movements of Additional Paid-in Capital for Associates and Joint Ventures Accounted for Using Equity Method |  |  | Movements of Additional Paid-in Capital Arising from Changes in Equities of Subsidiaries |  |  | Difference between Consideration Received or Paid and Carrying Amount of the Subsidiaries’ Net Assets during Actual Disposal or Acquisition |  |  | Donated Capital |  |  | Stockholders’ Contribution Due to Privatization |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Balance on January 1, 2021 |  | $ | 126,045 |  |  | $ | — |  |  | $ | 2,089 |  |  | $ | 987 |  |  | $ | 21 |  |  | $ | 20,648 |  |  | $ | 149,790 |
Unclaimed dividend |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 2 |
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |
Share-based payment transactions of subsidiaries |  |  | — |  |  |  | — |  |  |  | 17 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 17 |
Balance on December 31, 2021 |  | $ | 126,045 |  |  | $ | 1 |  |  | $ | 2,106 |  |  | $ | 987 |  |  | $ | 23 |  |  | $ | 20,648 |  |  | $ | 149,810 |
Balance on January 1, 2022 |  | $ | 126,045 |  |  | $ | 1 |  |  | $ | 2,106 |  |  | $ | 987 |  |  | $ | 23 |  |  | $ | 20,648 |  |  | $ | 149,810 |
Unclaimed dividend |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 2 |
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries |  |  | — |  |  |  | — |  |  |  | 5 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5 |
Share-based payment transactions of subsidiaries |  |  | — |  |  |  | — |  |  |  | 27 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 27 |
Balance on December 31, 2022 |  | $ | 126,045 |  |  | $ | 1 |  |  | $ | 2,138 |  |  | $ | 987 |  |  | $ | 25 |  |  | $ | 20,648 |  |  | $ | 149,844 |
Balance on January 1, 2023 |  | $ | 126,045 |  |  | $ | 1 |  |  | $ | 2,138 |  |  | $ | 987 |  |  | $ | 25 |  |  | $ | 20,648 |  |  | $ | 149,844 |
Unclaimed dividend |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 2 |
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method |  |  | — |  |  |  | (26 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (26 | )
Actual acquisition of interests in subsidiaries |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Share-based payment transactions of subsidiaries |  |  | — |  |  |  | — |  |  |  | 8 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 8 |
Balance on December 31, 2023 |  | $ | 126,045 |  |  | $ | (25 | ) |  | $ | 2,146 |  |  | $ | 987 |  |  | $ | 27 |  |  | $ | 20,648 |  |  | $ | 149,828 |
Appropriations of Earnings | The appropriations of the 2021 and 2022 earnings of Chunghwa approved by the stockholders in their meetings on May 27, 2022 and May 26, 2023, respectively, were as follows:
|  | Appropriation of Earnings |  |  | Dividends Per Share (NT$) |
|  | For Fiscal Year 2021 |  |  | For Fiscal Year 2022 |  |  | For Fiscal Year 2021 |  |  | For Fiscal Year 2022 |
Provision for (reversal of) special reserve |  | $ | 408 |  |  | $ | (185 | ) |  |  |  |  |  |
Cash dividends |  |  | 35,746 |  |  |  | 36,476 |  |  | $ | 4.608 |  |  | $ | 4.702 |
The appropriations of earnings for 2023 had been proposed by Chunghwa’s Board of Directors on February 23, 2024. The appropriations and dividends per share were as follows:
|  | Appropriation of Earnings |  |  | Dividends Per Share (NT$) |
Reversal of special reserve |  | $ | (223 | ) |  |  |
Cash dividends |  |  | 36,910 |  |  | $ | 4.758 |
Noncontrolling Interests | e. Noncontrolling interests
|  | Year Ended December 31 |
|  | 2021 |  |  | 2022 |  |  | 2023 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Beginning balance |  | $ | 11,158 |  |  | $ | 11,747 |  |  | $ | 12,408 |
Attributable to noncontrolling interests |  |  |  |  |  |  |  |  |
Net income for the year |  |  | 1,431 |  |  |  | 1,511 |  |  |  | 1,103 |
Exchange differences arising from the translation of the foreign operations |  |  | — |  |  |  | 21 |  |  |  | 2 |
Unrealized gain or loss on financial assets at FVOCI |  |  | 2 |  |  |  | (25 | ) |  |  | (22 | )
Remeasurements of defined benefit pension plans |  |  | (5 | ) |  |  | 24 |  |  |  | 12 |
Income tax relating to remeasurements of defined benefit pension plans |  |  | 1 |  |  |  | (5 | ) |  |  | (2 | )
Share of other comprehensive loss of associates and joint ventures accounted for using equity method |  |  | — |  |  |  | 5 |  |  |  | (21 | )
Cash dividends distributed by subsidiaries |  |  | (896 | ) |  |  | (1,053 | ) |  |  | (1,092 | )
Actual acquisition of interests in subsidiaries |  |  | — |  |  |  | — |  |  |  | — |
Share-based payment transactions of subsidiaries |  |  | 56 |  |  |  | 62 |  |  |  | 25 |
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries |  |  | — |  |  |  | 10 |  |  |  | — |
Net increase in noncontrolling interests |  |  | — |  |  |  | 111 |  |  |  | 19 |
Ending balance |  | $ | 11,747 |  |  | $ | 12,408 |  |  | $ | 12,432 |
FVOCI [Member] |
Disclosure Of Classes Of Share Capital [Line Items] |
Unrealized Gain or Loss on Financial Assets at FVOCI | 2) Unrealized gain or loss on financial assets at FVOCI
|  | Year Ended December 31 |
|  | 2021 |  |  | 2022 |  |  | 2023 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Beginning balance |  | $ | 1,240 |  |  | $ | (8 | ) |  | $ | (125 | )
Unrealized gain or loss for the year |  |  |  |  |  |  |  |  |
Equity instruments |  |  | (1,188 | ) |  |  | (111 | ) |  |  | 641 |
Share of loss of associates and joint ventures accounted for using equity method |  |  | — |  |  |  | (6 | ) |  |  | 5 |
Transferred accumulated gain or loss to unappropriated earnings resulting from the disposal of equity instruments (Note 9) |  |  | (60 | ) |  |  | — |  |  |  | — |
Ending balance |  | $ | (8 | ) |  | $ | (125 | ) |  | $ | 521 |

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