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Consolidated Statements of Changes in Equity $ in Millions, $ in Millions | TWD ($) | USD ($) | Common stocks [Member] TWD ($) | Common stocks [Member] USD ($) | Additional paid-in capital [Member] TWD ($) | Additional paid-in capital [Member] USD ($) | Legal reserve [Member] TWD ($) | Legal reserve [Member] USD ($) | Special reserve [Member] TWD ($) | Special reserve [Member] USD ($) | Unappropriated earnings [Member] TWD ($) | Unappropriated earnings [Member] USD ($) | Total retained earnings [Member] TWD ($) | Total retained earnings [Member] USD ($) | Exchange differences arising from the translation of the foreign operations [Member] TWD ($) | Exchange differences arising from the translation of the foreign operations [Member] USD ($) | Unrealized gain (loss) on available-for-sale financial assets [Member] TWD ($) | Unrealized gain (loss) on available-for-sale financial assets [Member] USD ($) | Unrealized gain or loss on financial assets at fair value through other comprehensive income [Member] TWD ($) | Unrealized gain or loss on financial assets at fair value through other comprehensive income [Member] USD ($) | Cash flow hedges [Member] TWD ($) | Cash flow hedges [Member] USD ($) | Gain or Loss on hedging instruments [Member] TWD ($) | Gain or Loss on hedging instruments [Member] USD ($) | Total other adjustments [Member] TWD ($) | Total other adjustments [Member] USD ($) | Total equity attributable to stockholders of the parent [Member] TWD ($) | Total equity attributable to stockholders of the parent [Member] USD ($) | Noncontrolling interests [Member] TWD ($) | Noncontrolling interests [Member] USD ($)
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Beginning balance at Dec. 31, 2016 | $ 366,928 |  | $ 77,574 |  | $ 147,180 |  | $ 77,574 |  | $ 2,676 |  | $ 55,657 |  | $ 135,907 |  | $ 46 |  | $ (51) |  | $ 0 |  | $ 0 |  | $ 0 |  | $ (5) |  | $ 360,656 |  | $ 6,272 |
Provision for special reserve | 0 |  | 0 |  | 0 |  | 0 |  | 5 |  | (5) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Cash dividends paid or distributed by Chunghwa | (38,336) |  | 0 |  | 0 |  | 0 |  | 0 |  | (38,336) |  | (38,336) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (38,336) |  | 0 |
Cash dividends distributed by subsidiaries | (942) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (942) |
Unclaimed dividend | 3 |  | 0 |  | 3 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 3 |  | 0 |
Change in additional paid-in capital from investments in associates and joint ventures accounted for using equity method | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Partial disposal of interests in subsidiaries | 106 |  | 0 |  | 77 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 77 |  | 29 |
Change in additional paid-in capital for not participating proportionately in the capital increase of subsidiaries | 2,552 |  | 0 |  | 802 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 802 |  | 1,750 |
Other changes in additional paid-in capital of subsidiaries | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Net income | 40,160 |  | 0 |  | 0 |  | 0 |  | 0 |  | 38,988 |  | 38,988 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 38,988 |  | 1,172 |
Total other comprehensive income (loss), net of income tax | (1,306) |  | 0 |  | 0 |  | 0 |  | 0 |  | (1,671) |  | (1,671) |  | (220) |  | 609 |  | 0 |  | (1) |  | 0 |  | 388 |  | (1,283) |  | (23) |
TOTAL COMPREHENSIVE INCOME | 38,854 |  | 0 |  | 0 |  | 0 |  | 0 |  | 37,317 |  | 37,317 |  | (220) |  | 609 |  | 0 |  | (1) |  | 0 |  | 388 |  | 37,705 |  | 1,149 |
Share-based payment transactions of subsidiaries | 22 |  | 0 |  | 2 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 2 |  | 20 |
Net increase (decrease) in noncontrolling interests | 223 |  | 0 |  | 27 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 27 |  | 196 |
Ending balance at Dec. 31, 2017 | 369,410 |  | 77,574 |  | 148,091 |  | 77,574 |  | 2,681 |  | 54,633 |  | 134,888 |  | (174) |  | 558 |  | 0 |  | (1) |  | 0 |  | 383 |  | 360,936 |  | 8,474 |
Effect of retrospective application (IFRS9 and IFRS15 [Member]) at Dec. 31, 2017 | 12,714 |  | 0 |  | 0 |  | 0 |  | 0 |  | 12,393 |  | 12,393 |  | 0 |  | (558) |  | 883 |  | 1 |  | (1) |  | 325 |  | 12,718 |  | (4) |
BALANCE, AS ADJUSTED at Dec. 31, 2017 | 382,124 |  | 77,574 |  | 148,091 |  | 77,574 |  | 2,681 |  | 67,026 |  | 147,281 |  | (174) |  | 0 |  | 883 |  | 0 |  | (1) |  | 708 |  | 373,654 |  | 8,470 |
Reversal of special reserve | 0 |  | 0 |  | 0 |  | 0 |  | (5) |  | 5 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Cash dividends paid or distributed by Chunghwa | (37,205) |  | 0 |  | 0 |  | 0 |  | 0 |  | (37,205) |  | (37,205) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (37,205) |  | 0 |
Cash dividends distributed by subsidiaries | (958) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (958) |
Unclaimed dividend | 2 |  | 0 |  | 2 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 2 |  | 0 |
Partial disposal of interests in subsidiaries | 1,175 |  | 0 |  | 826 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 826 |  | 349 |
Change in additional paid-in capital for not participating proportionately in the capital increase of subsidiaries | 1,477 |  | 0 |  | 777 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 777 |  | 700 |
Other changes in additional paid-in capital of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Net income | 38,581 |  | 0 |  | 0 |  | 0 |  | 0 |  | 37,557 |  | 37,557 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 37,557 |  | 1,024 |
Total other comprehensive income (loss), net of income tax | (1,014) |  | 0 |  | 0 |  | 0 |  | 0 |  | (757) |  | (757) |  | 95 |  | 0 |  | (345) |  | 0 |  | 2 |  | (248) |  | (1,005) |  | (9) |
TOTAL COMPREHENSIVE INCOME | 37,567 |  | 0 |  | 0 |  | 0 |  | 0 |  | 36,800 |  | 36,800 |  | 95 |  | 0 |  | (345) |  | 0 |  | 2 |  | (248) |  | 36,552 |  | 1,015 |
Share-based payment transactions of subsidiaries | 53 |  | 0 |  | 11 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 11 |  | 42 |
Net increase (decrease) in noncontrolling interests | 294 |  | 0 |  | 55 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 55 |  | 239 |
Ending balance at Dec. 31, 2018 | 384,529 |  | 77,574 |  | 149,762 |  | 77,574 |  | 2,676 |  | 66,626 |  | 146,876 |  | (79) |  | 0 |  | 538 |  | 0 |  | 1 |  | 460 |  | 374,672 |  | 9,857 |
Effect of retrospective application (IFRS16 [Member]) at Dec. 31, 2018 | (71) |  | 0 |  | 0 |  | 0 |  | 0 |  | (51) |  | (51) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (51) |  | (20) |
BALANCE, AS ADJUSTED at Dec. 31, 2018 | 384,458 |  | 77,574 |  | 149,762 |  | 77,574 |  | 2,676 |  | 66,575 |  | 146,825 |  | (79) |  | 0 |  | 538 |  | 0 |  | 1 |  | 460 |  | 374,621 |  | 9,837 |
Cash dividends paid or distributed by Chunghwa | (34,746) |  | 0 |  | 0 |  | 0 |  | 0 |  | (34,746) |  | (34,746) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (34,746) |  | 0 |
Cash dividends distributed by subsidiaries | (710) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (710) |
Unclaimed dividend | 1 |  | 0 |  | 1 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 1 |  | 0 |
Partial disposal of interests in subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Other changes in additional paid-in capital of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Net income | 33,921 | $ 1,134 | 0 |  | 0 |  | 0 |  | 0 |  | 32,947 |  | 32,947 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 32,947 |  | 974 |
Total other comprehensive income (loss), net of income tax | 1,328 | 44 | 0 |  | 0 |  | 0 |  | 0 |  | 1,208 |  | 1,208 |  | (69) |  | 0 |  | 197 |  | 0 |  | (1) |  | 127 |  | 1,335 |  | (7) |
TOTAL COMPREHENSIVE INCOME | 35,249 | 1,178 | 0 |  | 0 |  | 0 |  | 0 |  | 34,155 |  | 34,155 |  | (69) |  | 0 |  | 197 |  | 0 |  | (1) |  | 127 |  | 34,282 |  | 967 |
Share-based payment transactions of subsidiaries | 21 |  | 0 |  | (1) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (1) |  | 22 |
Net increase (decrease) in noncontrolling interests | (1) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (1) |
Ending balance at Dec. 31, 2019 | $ 384,272 | $ 12,848 | $ 77,574 | $ 2,594 | $ 149,762 | $ 5,007 | $ 77,574 | $ 2,594 | $ 2,676 | $ 89 | $ 65,984 | $ 2,206 | $ 146,234 | $ 4,889 | $ (148) | $ (5) | $ 0 | $ 0 | $ 735 | $ 25 | $ 0 | $ 0 | $ 0 | $ 0 | $ 587 | $ 20 | $ 374,157 | $ 12,510 | $ 10,115 | $ 338

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