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Consolidated Statements of Changes in Equity shares in Millions, $ in Millions, $ in Millions | TWD ($) | USD ($) | Capital Stock - Common Stock [member] TWD ($) shares | Capital Stock - Common Stock [member] USD ($) shares | Capital Surplus [member] TWD ($) | Capital Surplus [member] USD ($) | Retained Earnings - Legal Capital Reserve [member] TWD ($) | Retained Earnings - Legal Capital Reserve [member] USD ($) | Retained Earnings - Special Capital Reserve [member] TWD ($) | Retained Earnings - Special Capital Reserve [member] USD ($) | Retained Earnings - Unappropriated Earnings [member] TWD ($) | Retained Earnings - Unappropriated Earnings [member] USD ($) | Retained Earnings [member] TWD ($) | Retained Earnings [member] USD ($) | Others - Foreign Currency Translation Reserve [member] TWD ($) | Others - Foreign Currency Translation Reserve [member] USD ($) | Other - Unrealized Gain (Loss) on Financial Assets at Fair Value Through Other Comprehensive Income [member] TWD ($) | Other - Unrealized Gain (Loss) on Financial Assets at Fair Value Through Other Comprehensive Income [member] USD ($) | Other - Gain (Loss) on Hedging Instruments [member] TWD ($) | Other - Gain (Loss) on Hedging Instruments [member] USD ($) | Others - Unearned Stock-Based Employee Compensation [member] TWD ($) | Others - Total [member] TWD ($) | Others - Total [member] USD ($) | Total Equity Attributable to Shareholders of the Parent [member] TWD ($) | Total Equity Attributable to Shareholders of the Parent [member] USD ($) | Non-controlling Interests [member] TWD ($) | Non-controlling Interests [member] USD ($)
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Beginning balance at Dec. 31, 2018 | $ 1,661,105.1 |  | $ 259,303.8 |  | $ 56,316.0 |  | $ 276,033.9 |  | $ 26,907.5 |  | $ 1,057,317.5 |  | $ 1,360,258.9 |  | $ (12,042.4) |  | $ (3,429.3) |  | $ 23.6 |  | $ (1.8) | $ (15,449.9) |  | $ 1,660,428.8 |  | $ 676.3 |
Beginning balance, shares at Dec. 31, 2018 | shares |  |  | 25,930.3 | 25,930.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal capital reserve |  |  |  |  |  |  | 35,113.1 |  |  |  | (35,113.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special capital reserve |  |  |  |  |  |  |  |  | (16,232.4) |  | 16,232.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends to shareholders | (388,955.7) |  |  |  |  |  |  |  |  |  | (388,955.7) |  | (388,955.7) |  |  |  |  |  |  |  |  |  |  | (388,955.7) |  |  |
Total | (388,955.7) |  |  |  |  |  | 35,113.1 |  | (16,232.4) |  | (407,836.4) |  | (388,955.7) |  |  |  |  |  |  |  |  |  |  | (388,955.7) |  |  |
Net income(loss) | 354,027.0 |  |  |  |  |  |  |  |  |  | 353,948.0 |  | 353,948.0 |  |  |  |  |  |  |  |  |  |  | 353,948.0 |  | 79.0 |
Other comprehensive income (loss), net of income tax | (11,823.5) |  |  |  |  |  |  |  |  |  | 217.1 |  | 217.1 |  | (14,829.0) |  | 2,898.5 |  | (109.7) |  |  | (12,040.2) |  | (11,823.1) |  | (0.4) |
Total comprehensive income (loss) | 342,203.5 |  |  |  |  |  |  |  |  |  | 354,165.1 |  | 354,165.1 |  | (14,829.0) |  | 2,898.5 |  | (109.7) |  |  | (12,040.2) |  | 342,124.9 |  | 78.6 |
Disposal of investments in equity instruments at fair value through other comprehensive income |  |  |  |  |  |  |  |  |  |  | 162.1 |  | 162.1 |  |  |  | (162.1) |  |  |  |  | (162.1) |  |  |  |  |
Basis adjustment for gain (loss) on hedging instruments | 82.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82.3 |  |  | 82.3 |  | 82.3 |  |  |
Adjustments to share of changes in equities of associates | 21.2 |  |  |  | 19.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.6 | 1.6 |  | 21.0 |  | 0.2 |
From share of changes in equities of subsidiaries |  |  |  |  | 0.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.3 |  | (0.3) |
Donation from shareholders | 4.0 |  |  |  | 4.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.0 |  |  |
Increase (Decrease) in non-controlling interests | (73.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (73.1) |
Ending balance at Dec. 31, 2019 | 1,614,387.3 |  | $ 259,303.8 |  | 56,339.7 |  | 311,147.0 |  | 10,675.1 |  | 1,003,808.3 |  | 1,325,630.4 |  | (26,871.4) |  | (692.9) |  | (3.8) |  | (0.2) | (27,568.3) |  | 1,613,705.6 |  | 681.7 |
Ending balance, shares at Dec. 31, 2019 | shares |  |  | 25,930.3 | 25,930.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special capital reserve |  |  |  |  |  |  |  |  | 31,584.0 |  | (31,584.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends to shareholders | (259,303.8) |  |  |  |  |  |  |  |  |  | (259,303.8) |  | (259,303.8) |  |  |  |  |  |  |  |  |  |  | (259,303.8) |  |  |
Total | (259,303.8) |  |  |  |  |  |  |  | 31,584.0 |  | (290,887.8) |  | (259,303.8) |  |  |  |  |  |  |  |  |  |  | (259,303.8) |  |  |
Net income(loss) | 511,008.0 |  |  |  |  |  |  |  |  |  | 510,744.0 |  | 510,744.0 |  |  |  |  |  |  |  |  |  |  | 510,744.0 |  | 264.0 |
Other comprehensive income (loss), net of income tax | (30,321.8) |  |  |  |  |  |  |  |  |  | (3,121.8) |  | (3,121.8) |  | (30,130.2) |  | 2,906.0 |  | 24.1 |  |  | (27,200.1) |  | (30,321.9) |  | 0.1 |
Total comprehensive income (loss) | 480,686.2 |  |  |  |  |  |  |  |  |  | 507,622.2 |  | 507,622.2 |  | (30,130.2) |  | 2,906.0 |  | 24.1 |  |  | (27,200.1) |  | 480,422.1 |  | 264.1 |
Disposal of investments in equity instruments at fair value through other comprehensive income |  |  |  |  |  |  |  |  |  |  | (108.7) |  | (108.7) |  |  |  | 108.7 |  |  |  |  | 108.7 |  |  |  |  |
Basis adjustment for gain (loss) on hedging instruments | (20.3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20.3) |  |  | (20.3) |  | (20.3) |  |  |
Adjustments to share of changes in equities of associates | 0.5 |  |  |  | 0.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.2 | 0.2 |  | 0.5 |  |  |
Donation from shareholders | 7.2 |  |  |  | 7.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.2 |  |  |
Increase (Decrease) in non-controlling interests | 6.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.7 |
Ending balance at Dec. 31, 2020 | 1,835,763.8 |  | $ 259,303.8 |  | 56,347.2 |  | 311,147.0 |  | 42,259.1 |  | 1,220,434.0 |  | 1,573,840.1 |  | (57,001.6) |  | 2,321.8 |  |  |  |  | (54,679.8) |  | 1,834,811.3 |  | 952.5 |
Ending balance, shares at Dec. 31, 2020 | shares |  |  | 25,930.3 | 25,930.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special capital reserve |  |  |  |  |  |  |  |  | 17,045.1 |  | (17,045.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends to shareholders | (278,751.6) |  |  |  |  |  |  |  |  |  | (278,751.6) |  | (278,751.6) |  |  |  |  |  |  |  |  |  |  | (278,751.6) |  |  |
Total | (278,751.6) |  |  |  |  |  |  |  | 17,045.1 |  | (295,796.7) |  | (278,751.6) |  |  |  |  |  |  |  |  |  |  | (278,751.6) |  |  |
Net income(loss) | 592,880.6 | $ 21,372.8 |  |  |  |  |  |  |  |  | 592,359.2 |  | 592,359.2 |  |  |  |  |  |  |  |  |  |  | 592,359.2 |  | 521.4 |
Other comprehensive income (loss), net of income tax | (7,619.4) | (274.7) |  |  |  |  |  |  |  |  | 167.5 |  | 167.5 |  | (6,301.7) |  | (1,559.8) |  | 72.1 |  |  | (7,789.4) |  | (7,621.9) |  | 2.5 |
Total comprehensive income (loss) | 585,261.2 | 21,098.1 |  |  |  |  |  |  |  |  | 592,526.7 |  | 592,526.7 |  | (6,301.7) |  | (1,559.8) |  | 72.1 |  |  | (7,789.4) |  | 584,737.3 |  | 523.9 |
Disposal of investments in equity instruments at fair value through other comprehensive income |  |  |  |  |  |  |  |  |  |  | 187.7 |  | 187.7 |  |  |  | (187.7) |  |  |  |  | (187.7) |  |  |  |  |
Basis adjustment for gain (loss) on hedging instruments | 48.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.5 |  |  | 48.5 |  | 48.5 |  |  |
Adjustments to share of changes in equities of associates | 4.8 |  |  |  | 4.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.8 |  |  |
From difference between the consideration received and the carrying amount of the subsidiaries' net assets during actual disposal | 9,451.8 |  |  |  | 8,406.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,406.3 |  | 1,045.5 |
From share of changes in equities of subsidiaries |  |  |  |  | (7.9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7.9) |  | 7.9 |
Donation from shareholders | 11.2 |  |  |  | 11.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.1 |  | 0.1 |
Increase (Decrease) in non-controlling interests | (107.4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (107.4) |
Effect of acquisition of subsidiary | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.2 |
Ending balance at Dec. 31, 2021 | $ 2,151,682.5 | $ 77,566.0 | $ 259,303.8 | $ 9,347.7 | $ 64,761.5 | $ 2,334.6 | $ 311,147.0 | $ 11,216.5 | $ 59,304.2 | $ 2,137.9 | $ 1,517,351.7 | $ 54,699.0 | $ 1,887,802.9 | $ 68,053.4 | $ (63,303.3) | $ (2,282.0) | $ 574.3 | $ 20.7 | $ 120.6 |  |  | $ (62,608.4) | $ (2,257.0) | $ 2,149,259.8 | $ 77,478.7 | $ 2,422.7 | $ 87.3
Ending balance, shares at Dec. 31, 2021 | shares |  |  | 25,930.3 | 25,930.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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