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Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of classes of share capital [Line Items] |
Summary of Common Stocks |
| 1) | Common stocks
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | 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, 2015, 2016 and 2017 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 and Carrying Amount of the Subsidiaries’ Net Assets upon Disposal |  |  |  |  | Donated Capital |  |  |  |  | Stockholders’ Contribution Due to Privatization |  |  | Total |
|  | NT$ |  |  | NT$ |  |  |  |  | NT$ |  |  |  |  | NT$ |  |  |  |  | NT$ |  |  |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Balance on January 1, 2015 |  | $ | 126,045 |  |  | $ | — |  |  |  |  | $ | 14 |  |  |  |  | $ | — |  |  |  |  | $ | 13 |  |  |  |  | $ | 20,648 |  |  | $ | 146,720 |
Partial disposal of interests in subsidiaries |  |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 27 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | 27 |
Other changes in additional paid-in capital in subsidiaries |  |  | — |  |  |  | — |  |  |  |  |  | 1 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | 1 |
Subsidiary purchased its treasury stock |  |  | — |  |  |  | — |  |  |  |  |  | (15 | ) |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | (15 | )
Balance on December 31, 2015 |  | $ | 126,045 |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 27 |  |  |  |  | $ | 13 |  |  |  |  | $ | 20,648 |  |  | $ | 146,733 |
Balance on January 1, 2016 |  | $ | 126,045 |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 27 |  |  |  |  | $ | 13 |  |  |  |  | $ | 20,648 |  |  | $ | 146,733 |
Partial disposal of interests in subsidiaries |  |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 58 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | 58 |
Change in additional paid-in capital for not participating in the capital increase of a subsidiary |  |  | — |  |  |  | — |  |  |  |  |  | 389 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | 389 |
Share-based payment transactions of subsidiaries |  |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | — |
Balance on December 31, 2016 |  | $ | 126,045 |  |  | $ | — |  |  |  |  | $ | 389 |  |  |  |  | $ | 85 |  |  |  |  | $ | 13 |  |  |  |  | $ | 20,648 |  |  | $ | 147,180 |
Balance on January 1, 2017 |  | $ | 126,045 |  |  | $ | — |  |  |  |  | $ | 389 |  |  |  |  | $ | 85 |  |  |  |  | $ | 13 |  |  |  |  | $ | 20,648 |  |  | $ | 147,180 |
Unclaimed dividend |  |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | 3 |  |  |  |  |  | — |  |  |  | 3 |
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method |  |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | — |
Partial disposal of interests in subsidiaries |  |  | — |  |  |  | — |  |  |  |  |  | 1 |  |  |  |  |  | 76 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | 77 |
Change in additional paid-in capital for not participating in the capital increase of a subsidiary |  |  | — |  |  |  | — |  |  |  |  |  | 802 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | 802 |
Other changes in additional paid-in capital in subsidiaries |  |  | — |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | — |
Share-based payment transactions of subsidiaries |  |  | — |  |  |  | — |  |  |  |  |  | 2 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | 2 |
Treasury stock transfer of subsidiaries |  |  | — |  |  |  | — |  |  |  |  |  | 27 |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  |  |  | — |  |  |  | 27 |
Balance on December 31, 2017 |  | $ | 126,045 |  |  | $ | — |  |  |  |  | $ | 1,221 |  |  |  |  | $ | 161 |  |  |  |  | $ | 16 |  |  |  |  | $ | 20,648 |  |  | $ | 148,091 |
Appropriations of Earnings | The appropriations of the 2015 and 2016 earnings of Chunghwa approved by the stockholders in their meetings on June 24, 2016 and June 23, 2017 were as follows:
|  | Appropriation of Earnings |  |  | Dividends Per Share |
|  | For Fiscal Year 2015 |  |  | For Fiscal Year 2016 |  |  | For Fiscal Year 2015 |  |  | For Fiscal Year 2016 |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  |  |  |  |  |  |  |
Special reserve |  | $ | — |  |  | $ | 5 |  |  |  |  |  |  |  |  |
Cash dividends |  |  | 42,551 |  |  |  | 38,336 |  |  | $ | 5.4852 |  |  | $ | 4.9419 |
|  | For Fiscal Year 2017 |
|  | Appropriation of Earnings |  |  | Dividends Per Share |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  |  |  |
Reversal of special reserve |  | $ | 5 |  |  |  |  |
Cash dividends |  |  | 37,205 |  |  | $ | 4.796 |
Noncontrolling Interests |
| e. | Noncontrolling interests
|  | Year Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Beginning balance |  | $ | 4,924 |  |  | $ | 5,065 |  |  | $ | 6,272 |
Attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |
Net income for the year |  |  | 813 |  |  |  | 1,141 |  |  |  | 1,172 |
Exchange differences arising from the translation of the foreign operations |  |  | (3 | ) |  |  | (41 | ) |  |  | (12 | )
Unrealized gain (loss) on available-for-sale financial assets |  |  | 2 |  |  |  | — |  |  |  | (2 | )
Income tax relating to unrealized gain and loss on available-for-sale financial assets |  |  | — |  |  |  | — |  |  |  | 1 |
Remeasurements of defined benefit pension plans |  |  | (3 | ) |  |  | (18 | ) |  |  | (8 | )
Income tax relating to remeasurements of defined benefit pension plans |  |  | 1 |  |  |  | 3 |  |  |  | — |
Share of other comprehensive income (loss) of associates accounted for using equity method |  |  | 2 |  |  |  | (1 | ) |  |  | (2 | )
Cash dividends distributed by subsidiaries |  |  | (350 | ) |  |  | (710 | ) |  |  | (942 | )
Partial disposal of interests in subsidiaries |  |  | 18 |  |  |  | 25 |  |  |  | 29 |
Change in additional paid-in capital for not participating in the capital increase of a subsidiary |  |  | — |  |  |  | 786 |  |  |  | 1,750 |
Other changes in additional paid-in capital of subsidiaries |  |  | 2 |  |  |  | — |  |  |  | — |
Share-based payment transactions of subsidiaries |  |  | 36 |  |  |  | 17 |  |  |  | 20 |
Subsidiary purchased its treasury stock |  |  | (416 | ) |  |  | — |  |  |  | — |
Net increase in noncontrolling interests |  |  | 39 |  |  |  | 5 |  |  |  | 196 |
Ending balance |  | $ | 5,065 |  |  | $ | 6,272 |  |  | $ | 8,474 |
Unrealized gain (loss) on available-for-sale financial assets [Member] |
Disclosure of classes of share capital [Line Items] |
Unrealized Gain (Loss) on Available-for-sale Financial Assets |
| 2) | Unrealized gain (loss) on available-for-sale financial assets
|  | Year Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Beginning balance |  | $ | 740 |  |  | $ | 91 |  |  | $ | (51 | )
Unrealized gain (loss) on available-for-sale financial assets |  |  | (670 | ) |  |  | (721 | ) |  |  | 607 |
Income tax relating to unrealized gain and loss on available-for-sale financial assets |  |  | (2 | ) |  |  | 2 |  |  |  | 2 |
Amount reclassified from equity to profit or loss on disposal of available-for-sale financial assets |  |  | — |  |  |  | — |  |  |  | — |
Amount reclassified from equity to profit or loss on impairment of available-for-sale financial assets |  |  | 23 |  |  |  | 577 |  |  |  | — |
Ending balance |  | $ | 91 |  |  | $ | (51 | ) |  | $ | 558 |

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