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Consolidated Statements of Changes in Equity $ in Thousands, $ in Thousands | TWD ($) | USD ($) | Share capital [member] TWD ($) shares | Share capital [member] USD ($) shares | Capital surplus [member] TWD ($) | Capital surplus [member] USD ($) | Legal reserve [member] TWD ($) | Legal reserve [member] USD ($) | Special reserve [member] TWD ($) | Special reserve [member] USD ($) | Unappropriated earnings [member] TWD ($) | Unappropriated earnings [member] USD ($) | Retained earnings [member] TWD ($) | Retained earnings [member] USD ($) | Exchange differences on translating foreign operations [member] TWD ($) | Exchange differences on translating foreign operations [member] USD ($) | Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member] TWD ($) | Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member] USD ($) | Gain loss on hedging instrument [Member] TWD ($) | Gain loss on hedging instrument [Member] USD ($) | Other equity[member] TWD ($) | Other equity[member] USD ($) | Treasury shares [member] TWD ($) | Treasury shares [member] USD ($) | Equity Attributable to Owners of the Company [member] TWD ($) | Equity Attributable to Owners of the Company [member] USD ($) | Non-controlling interests [member] TWD ($) | Non-controlling interests [member] USD ($) | Unearned Employee Compensation [Member] TWD ($) | Unearned Employee Compensation [Member] USD ($)
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Balance at January 1 (Adjusted Balance [member]) at Dec. 31, 2018 | $ 219,027,922 |  | $ 43,217,144 |  | $ 143,276,664 |  |  |  | $ 3,353,938 |  | $ 20,403,477 |  | $ 23,757,415 |  | $ (5,888,574) |  | $ (1,015,107) |  |  |  | $ (6,903,681) |  | $ (1,959,107) |  | $ 201,388,435 |  | $ 17,639,487 |  |  |
Balance at January 1 at Dec. 31, 2018 |  |  | 4,321,714 |  |  |  |  |  |  |  |  |  |  |  | (5,888,574) |  |  |  |  |  |  |  |  |  |  |  | 17,639,487 |  |  |
Appropriation of earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal reserve |  |  |  |  |  |  | $ 2,203,895 |  |  |  | (2,203,895) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special reserve |  |  |  |  |  |  |  |  | 3,548,844 |  | (3,548,844) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends distributed by the Company | (10,806,454) |  |  |  |  |  |  |  |  |  | (10,806,454) |  | (10,806,454) |  |  |  |  |  |  |  |  |  |  |  | (10,806,454) |  |  |  |  |
Change from investments in associates accounted for using the equity method | 3,604 |  |  |  | 3,604 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,604 |  |  |  |  |
Other changes in the capital surplus | 1,070 |  |  |  | 1,070 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,070 |  |  |  |  |
Net profit for the year | 18,268,565 |  |  |  |  |  |  |  |  |  | 17,060,591 |  | 17,060,591 |  |  |  |  |  |  |  |  |  |  |  | 17,060,591 |  | 1,207,974 |  |  |
Other comprehensive income (loss) for the year, net of income tax | (4,370,611) |  |  |  |  |  |  |  |  |  | (280,461) |  | (280,461) |  | (4,874,110) |  | 1,216,165 |  |  |  | (3,657,945) |  |  |  | (3,938,406) |  | (432,205) |  |  |
Total comprehensive income (loss) | 13,897,954 |  |  |  |  |  |  |  |  |  | 16,780,130 |  | 16,780,130 |  | (4,874,110) |  | 1,216,165 |  |  |  | (3,657,945) |  |  |  | 13,122,185 |  | 775,769 |  |  |
Issue of ordinary shares for capital increase by cash | (10,806,454) |  |  |  |  |  | 2,203,895 |  | 3,548,844 |  | (16,559,193) |  | (10,806,454) |  |  |  |  |  |  |  |  |  |  |  | (10,806,454) |  |  |  |  |
Cash dividends received by subsidiaries from the Company | 182,354 |  |  |  | 182,354 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 182,354 |  |  |  |  |
Disposal of interest in associates and joint ventures accounted for using the equity method | (73,884) |  |  |  | (75,276) |  |  |  |  |  | 1,392 |  | 1,392 |  |  |  |  |  |  |  |  |  |  |  | (73,884) |  |  |  |  |
Differences between consideration and carrying amount arising from acquisition or disposal of subsidiaries | (7,114,703) |  |  |  | (2,779,613) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,779,613) |  | (4,335,090) |  |  |
Changes in percentage of ownership interest in subsidiaries | (3,977,486) |  |  |  | (1,960,167) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,960,167) |  | (2,017,319) |  |  |
Issue of ordinary shares under share-based payment arrangements | 1,225,163 |  | $ 88,143 |  | 1,137,020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,225,163 |  |  |  |  |
Issue of ordinary shares under share-based payment arrangements (Shares) | shares |  |  | 8,814,000 | 8,814,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends distributed by subsidiaries | (360,245) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (360,245) |  |  |
Additional non-controlling interest arising on issue of employee share options by subsidiaries | 797,017 |  |  |  | (875,293) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (875,293) |  | 1,672,310 |  |  |
Disposal of investments in equity instruments at fair value through other comprehensive income |  |  |  |  |  |  |  |  |  |  | 404,156 |  | 404,156 |  |  |  | (404,156) |  |  |  | (404,156) |  |  |  |  |  |  |  |  |
Balance at December 31 at Dec. 31, 2019 | 212,802,312 |  | $ 43,305,287 |  | 138,910,363 |  | 2,203,895 |  | 6,902,782 |  | 21,029,962 |  | 30,136,639 |  | (10,762,684) |  | (203,098) |  |  |  | (10,965,782) |  | (1,959,107) |  | 199,427,400 |  | 13,374,912 |  |  |
Ending balance, shares at Dec. 31, 2019 | shares |  |  | 4,330,528 | 4,330,528 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Appropriation of earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal reserve |  |  |  |  |  |  | 1,697,489 |  |  |  | (1,697,489) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special reserve |  |  |  |  |  |  |  |  | 3,944,915 |  | (3,944,915) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends distributed by the Company | (8,668,331) |  |  |  |  |  |  |  |  |  | (8,668,331) |  | (8,668,331) |  |  |  |  |  |  |  |  |  |  |  | (8,668,331) |  |  |  |  |
Change from investments in associates accounted for using the equity method | 22,774 |  |  |  | 22,774 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,774 |  |  |  |  |
Other changes in the capital surplus | 1,608 |  |  |  | 1,608 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,608 |  |  |  |  |
Net profit for the year | 28,651,900 |  |  |  |  |  |  |  |  |  | 26,970,580 |  | 26,970,580 |  |  |  |  |  |  |  |  |  |  |  | 26,970,580 |  | 1,681,320 |  |  |
Other comprehensive income (loss) for the year, net of income tax | 495,313 |  |  |  |  |  |  |  |  |  | (469,748) |  | (469,748) |  | (879,255) |  | 2,248,414 |  | $ (429,265) |  | 939,894 |  |  |  | 470,146 |  | 25,167 |  |  |
Total comprehensive income (loss) | 29,147,213 |  |  |  |  |  |  |  |  |  | 26,500,832 |  | 26,500,832 |  | (879,255) |  | 2,248,414 |  | (429,265) |  | 939,894 |  |  |  | 27,440,726 |  | 1,706,487 |  |  |
Issue of ordinary shares for capital increase by cash | (8,668,331) |  |  |  |  |  | 1,697,489 |  | 3,944,915 |  | (14,310,735) |  | (8,668,331) |  |  |  |  |  |  |  |  |  |  |  | (8,668,331) |  |  |  |  |
Cash dividends received by subsidiaries from the Company | 145,741 |  |  |  | 145,741 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 145,741 |  |  |  |  |
Disposal of interest in associates and joint ventures accounted for using the equity method | 2,313 |  |  |  | 2,199 |  |  |  |  |  | (980) |  | (980) |  |  |  | 1,094 |  | 0 |  | 1,094 |  |  |  | 2,313 |  |  |  |  |
Differences between consideration and carrying amount arising from acquisition or disposal of subsidiaries | (129,942) |  |  |  | (13,502) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (13,502) |  | (116,440) |  |  |
Changes in percentage of ownership interest in subsidiaries | (4,128,788) |  |  |  | (780,533) |  |  |  |  |  | (2,760,175) |  | (2,760,175) |  |  |  |  |  |  |  |  |  |  |  | (3,540,708) |  | (588,080) |  |  |
Issue of ordinary shares under share-based payment arrangements | 1,799,425 |  | $ 210,633 |  | 1,588,792 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,799,425 |  |  |  |  |
Issue of ordinary shares under share-based payment arrangements (Shares) | shares |  |  | 21,064,000 | 21,064,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends distributed by subsidiaries | (346,774) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (346,774) |  |  |
Additional non-controlling interest arising on issue of employee share options by subsidiaries | 1,089,565 |  |  |  | (109,892) |  |  |  |  |  | (392,447) |  | (392,447) |  |  |  |  |  |  |  |  |  |  |  | (502,339) |  | 1,591,904 |  |  |
Disposal of investments in equity instruments at fair value through other comprehensive income |  |  |  |  |  |  |  |  |  |  | 18,508 |  | 18,508 |  |  |  | (18,508) |  |  |  | (18,508) |  |  |  |  |  |  |  |  |
Balance at December 31 at Dec. 31, 2020 | 231,737,116 |  | $ 43,515,920 |  | 139,767,550 |  | 3,901,384 |  | 10,847,697 |  | 30,084,965 |  | 44,834,046 |  | (11,641,939) | $ (419,681) | 2,027,902 |  | (429,265) |  | (10,043,302) |  | (1,959,107) |  | 216,115,107 |  | 15,622,009 | $ 563,158 |  |
Ending balance, shares at Dec. 31, 2020 | shares |  |  | 4,351,592 | 4,351,592 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Appropriation of earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal reserve |  |  |  |  |  |  | 2,398,814 |  |  |  | (2,398,814) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special reserve |  |  |  |  |  |  |  |  | (1,278,670) |  | 1,278,670 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends distributed by the Company | (18,389,856) |  |  |  |  |  |  |  |  |  | (18,389,856) |  | (18,389,856) |  |  |  |  |  |  |  |  |  |  |  | (18,389,856) |  |  |  |  |
Change from investments in associates accounted for using the equity method | (30,533) |  |  |  | (30,533) |  |  |  |  |  | 450,054 |  | 450,054 |  |  |  | (450,054) |  |  |  | (450,054) |  |  |  | (30,533) |  |  |  |  |
Other changes in the capital surplus | 1,633 |  |  |  | 1,633 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,633 |  |  |  |  |
Net profit for the year | 62,249,997 | $ 2,244,050 |  |  |  |  |  |  |  |  | 60,150,167 |  | 60,150,167 |  |  |  |  |  |  |  |  |  |  |  | 60,150,167 |  | 2,099,830 |  |  |
Other comprehensive income (loss) for the year, net of income tax | 406,016 | 14,637 |  |  |  |  |  |  |  |  | 25,842 |  | 25,842 |  | (3,751,707) |  | 3,654,754 |  | 551,098 |  | 454,145 |  |  |  | 479,987 |  | (73,971) |  |  |
Total comprehensive income (loss) | 62,656,013 | 2,258,687 |  |  |  |  |  |  |  |  | 60,176,009 |  | 60,176,009 |  | (3,751,707) |  | 3,654,754 |  | 551,098 |  | 454,145 |  |  |  | 60,630,154 |  | 2,025,859 |  |  |
Buy-back of ordinary shares | (5,529,255) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,529,255) |  | (5,529,255) |  |  |  |  |
Issue of ordinary shares for capital increase by cash | (18,389,856) |  |  |  |  |  | 2,398,814 |  | (1,278,670) |  | (19,510,000) |  | (18,389,856) |  |  |  |  |  |  |  |  |  |  |  | (18,389,856) |  |  |  |  |
Issue of convertible bonds by subsidiaries | 393,199 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 393,199 |  |  |
Cash dividends received by subsidiaries from the Company | 305,737 |  |  |  | 305,737 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 305,737 |  |  |  |  |
Changes in percentage of ownership interest in subsidiaries | (5,337,683) |  |  |  | (58,448) |  |  |  |  |  | (2,530,714) |  | (2,530,714) |  |  |  |  |  |  |  |  |  |  |  | (2,589,162) |  | (2,748,521) |  |  |
Issue of ordinary shares under share-based payment arrangements | 3,054,372 |  | $ 570,582 |  | 3,648,781 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,164,991) |  |  |  | 3,054,372 |  |  |  | $ (1,164,991) |
Issue of ordinary shares under share-based payment arrangements (Shares) | shares |  |  | 57,058,000 | 57,058,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends distributed by subsidiaries | (1,062,529) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,062,529) |  |  |
Additional non-controlling interest arising on issue of employee share options by subsidiaries | 372,846 |  |  |  | 58,448 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,448 |  | 314,398 |  |  |
Disposal of investments in equity instruments at fair value through other comprehensive income |  |  |  |  |  |  |  |  |  |  | 1,042,241 |  | 1,042,241 |  |  |  | (1,042,241) |  |  |  | (1,042,241) |  |  |  |  |  |  |  |  |
Balance at December 31 at Dec. 31, 2021 | $ 268,171,060 | $ 9,667,306 | $ 44,086,502 | $ 1,589,275 | $ 143,693,168 | $ 5,179,999 | $ 6,300,198 | $ 227,116 | $ 9,569,027 | $ 344,954 | $ 69,712,555 | $ 2,513,070 | $ 85,581,780 | $ 3,085,140 | $ (15,393,646) | $ (554,926) | $ 4,190,361 | $ 151,058 | $ 121,833 | $ 4,392 | $ (12,246,443) | $ (441,472) | $ (7,488,362) | $ (269,948) | $ 253,626,645 | $ 9,142,994 | $ 14,544,415 | $ 524,312 | $ (1,164,991) | $ (41,996)
Ending balance, shares at Dec. 31, 2021 | shares |  |  | 4,408,650 | 4,408,650 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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