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Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Classes Of Share Capital [Line Items] |
Summary of Common Stocks |
| 1) | Common stocks
|  | December 31 |
|  | 2017 |  |  | 2018 |
|  | 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, 2016, 2017 and 2018 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, 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 |
Balance on January 1, 2018 |  | $ | 126,045 |  |  | $ | — |  |  | $ | 1,221 |  |  | $ | 161 |  |  | $ | 16 |  |  | $ | 20,648 |  |  | $ | 148,091 |
Unclaimed dividend |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 2 |
Partial disposal of interests in subsidiaries |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 826 |  |  |  | — |  |  |  | — |  |  |  | 826 |
Change in additional paid-in capital for not proportionately participating in the capital increase of a subsidiary |  |  | — |  |  |  | — |  |  |  | 777 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 777 |
Share-based payment transactions of subsidiaries |  |  | — |  |  |  | — |  |  |  | 11 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 11 |
Treasury stock transfer of subsidiaries |  |  | — |  |  |  | — |  |  |  | 55 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 55 |
Balance on December 31, 2018 |  | $ | 126,045 |  |  | $ | — |  |  | $ | 2,064 |  |  | $ | 987 |  |  | $ | 18 |  |  | $ | 20,648 |  |  | $ | 149,762 |
Appropriations of Earnings | The appropriations of the 2016 and 2017 earnings of Chunghwa approved by the stockholders in their meetings on June 23, 2017 and June 15, 2018 were as follows:
|  | Appropriation of Earnings |  |  | Dividends Per Share |
|  | For Fiscal Year 2016 |  |  | For Fiscal Year 2017 |  |  | For Fiscal Year 2016 |  |  | For Fiscal Year 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  |  |  |  |  |  |  |
Special reserve |  | $ | 5 |  |  | $ | (5 | ) |  |  |  |  |  |  |  |
Cash dividends |  |  | 38,336 |  |  |  | 37,205 |  |  | $ | 4.9419 |  |  | $ | 4.796 |
The appropriations of earnings for 2018 had been proposed by Chunghwa’s Board of Directors on March 19, 2019. The appropriations and dividends per share were as follows:
|  | For Fiscal Year 2018 |
|  | Appropriation of Earnings |  |  | Dividends Per Share |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  |  |  |
Cash dividends |  | $ | 34,746 |  |  | $ | 4.479 |
Noncontrolling Interests |
| e. | Noncontrolling interests
|  | Year Ended December 31 |
|  | 2016 |  |  | 2017 |  |  | 2018 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Beginning balance |  | $ | 5,065 |  |  | $ | 6,272 |  |  | $ | 8,474 |
Effect of retrospective application |  |  | — |  |  |  | — |  |  |  | (4 | )
Beginning balance as adjusted |  |  | 5,065 |  |  |  | 6,272 |  |  |  | 8,470 |
Attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |
Net income for the year |  |  | 1,141 |  |  |  | 1,172 |  |  |  | 1,024 |
Exchange differences arising from the translation of the net investment in foreign operations |  |  | (41 | ) |  |  | (12 | ) |  |  | (3 | )
Unrealized gain or loss on financial assets at FVOCI |  |  | — |  |  |  | — |  |  |  | (1 | )
Unrealized loss on available-for-sale financial assets |  |  | — |  |  |  | (2 | ) |  |  | — |
Income tax relating to unrealized gain and loss on available-for-sale financial assets |  |  | — |  |  |  | 1 |  |  |  | — |
Remeasurements of defined benefit pension plans |  |  | (18 | ) |  |  | (8 | ) |  |  | (9 | )
Income tax relating to remeasurements of defined benefit pension plans |  |  | 3 |  |  |  | — |  |  |  | 3 |
Share of other comprehensive income or loss of associates accounted for using equity method |  |  | (1 | ) |  |  | (2 | ) |  |  | 1 |
Cash dividends distributed by subsidiaries |  |  | (710 | ) |  |  | (942 | ) |  |  | (958 | )
Partial disposal of interests in subsidiaries |  |  | 25 |  |  |  | 29 |  |  |  | 349 |
Change in additional paid-in capital for not proportionately participating in the capital increase of subsidiaries |  |  | 786 |  |  |  | 1,750 |  |  |  | 700 |
Other changes in additional paid-in capital of subsidiaries |  |  | — |  |  |  | — |  |  |  | — |
Share-based payment transactions of subsidiaries |  |  | 17 |  |  |  | 20 |  |  |  | 42 |
Net increase in noncontrolling interests |  |  | 5 |  |  |  | 196 |  |  |  | 239 |
Ending balance |  | $ | 6,272 |  |  | $ | 8,474 |  |  | $ | 9,857 |
FVOCI [Member] |
Disclosure Of Classes Of Share Capital [Line Items] |
Unrealized Gain or Loss on Financial Assets at FVOCI |
| 3) | Unrealized gain or loss on financial assets at FVOCI
|  | Year Ended December 31 |
|  | 2018 |
|  | NT$ |
|  | (In Millions) |
Balance as of January 1, 2018 under IAS 39 |  | $ | — |
Effect of retrospective application of IFRS 9 |  |  | 883 |
Balance as of January 1, 2018 under IFRS 9 |  |  | 883 |
Unrealized gain or loss for the year |  |  |  |
Equity instruments |  |  | (345 | )
Balance as of December 31, 2018 |  | $ | 538 |
Unrealized gain (loss) on available-for-sale financial assets [Member] |
Disclosure Of Classes Of Share Capital [Line Items] |
Unrealized Gain or Loss on Available-for-sale Financial Assets |
| 2) | Unrealized gain or loss on available-for-sale financial assets
|  | Unrealized Gain or Loss on AFS Financial Assets |
|  | NT$ |
|  | (In Millions) |
Balance as of January 1, 2016 |  | $ | 91 |
Unrealized gain or loss on available-for-sale financial assets |  |  | (721 | )
Income tax relating to unrealized gain and loss on available-for-sale financial assets |  |  | 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 |  |  | 577 |
Balance as of December 31, 2016 |  | $ | (51 | )
Balance as of January 1, 2017 |  | $ | (51 | )
Unrealized gain or loss on available-for-sale financial assets |  |  | 607 |
Income tax relating to unrealized gain and loss on available-for-sale financial assets |  |  | 2 |
Amount reclassified from equity to profit or loss on disposal of available-for-sale financial assets |  |  | — |
Balance as of December 31, 2017 under IAS 39 |  |  | 558 |
Effect of retrospective application of IFRS 9 |  |  | (558 | )
Balance as of January 1, 2018 under IFRS 9 |  | $ | — |

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