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Consolidated Statements of Changes in Equity $ 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 ($) | Retained Earnings - Unappropriated Earnings [member] TWD ($) | 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 - Unearned Stock-Based Employee Compensation [member] USD ($) | Others - Total [member] TWD ($) | Others - Total [member] USD ($) | Treasury shares [member] TWD ($) | 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, 2021 | $ 2,151,682.5 |  | $ 259,303.8 |  | $ 64,761.5 |  | $ 311,147.0 |  | $ 59,304.2 | $ 1,517,351.7 |  | $ 1,887,802.9 |  | $ (63,303.3) |  | $ 574.3 |  | $ 120.6 |  |  |  | $ (62,608.4) |  |  | $ 2,149,259.8 |  | $ 2,422.7 |
Beginning balance, shares at Dec. 31, 2021 | shares |  |  | 25,930,300,000 | 25,930,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special capital reserve |  |  |  |  |  |  |  |  | (56,149.9) | 56,149.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends to shareholders | (285,234.2) |  |  |  |  |  |  |  |  | (285,234.2) |  | (285,234.2) |  |  |  |  |  |  |  |  |  |  |  |  | (285,234.2) |  |  |
Total | (285,234.2) |  |  |  |  |  |  |  | (56,149.9) | (229,084.3) |  | (285,234.2) |  |  |  |  |  |  |  |  |  |  |  |  | (285,234.2) |  |  |
Net income | 993,294.7 |  |  |  |  |  |  |  |  | 992,923.4 |  | 992,923.4 |  |  |  |  |  |  |  |  |  |  |  |  | 992,923.4 |  | 371.3 |
Other comprehensive income (loss), net of income tax | 42,430.1 |  |  |  |  |  |  |  |  | (49.5) |  | (49.5) |  | 51,560.0 |  | (10,327.4) |  | 1,411.6 |  |  |  | 42,644.2 |  |  | 42,594.7 |  | (164.6) |
Total comprehensive income (loss) | 1,035,724.8 |  |  |  |  |  |  |  |  | 992,873.9 |  | 992,873.9 |  | 51,560.0 |  | (10,327.4) |  | 1,411.6 |  |  |  | 42,644.2 |  |  | 1,035,518.1 |  | 206.7 |
Treasury stock acquired | (871.6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (871.6) | (871.6) |  |  |
Treasury stock retired |  |  | $ (13.9) |  | (3.0) |  |  |  |  | (854.7) |  | (854.7) |  |  |  |  |  |  |  |  |  |  |  | 871.6 |  |  |  |
Treasury stock retired, shares | shares |  |  | (1,400,000) | (1,400,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangements | 266.7 |  | $ 13.9 |  | 438.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (185.2) |  | (185.2) |  |  | 266.7 |  |  |
Share-based payment arrangements, shares | shares |  |  | 1,400,000 | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in equity instruments at fair value through other comprehensive income |  |  |  |  |  |  |  |  |  | 303.3 |  | 303.3 |  |  |  | (303.3) |  |  |  |  |  | (303.3) |  |  |  |  |  |
Basis adjustment for gain (loss) on hedging instruments | (52.9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (52.9) |  |  |  | (52.9) |  |  | (52.9) |  |  |
Adjustments to share of changes in equities of associates | 4.6 |  |  |  | 4.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.6 |  |  |
Increase in non-controlling interests | (167.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (167.0) |
From share of changes in equities of subsidiaries | 16,466.3 |  |  |  | 4,116.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,116.0 |  | 12,350.3 |
Donation from shareholders | 13.2 |  |  |  | 13.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.2 |  | 0.0 |
Decrease in non-controlling interests | (167.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (167.0) |
Ending balance at Dec. 31, 2022 | 2,917,832.4 |  | $ 259,303.8 |  | 69,330.3 |  | 311,147.0 |  | 3,154.3 | 2,280,589.9 |  | 2,594,891.2 |  | (11,743.3) |  | (10,056.4) |  | 1,479.3 |  | (185.2) |  | (20,505.6) |  |  | 2,903,019.7 |  | 14,812.7 |
Ending balance, shares at Dec. 31, 2022 | shares |  |  | 25,930,300,000 | 25,930,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special capital reserve |  |  |  |  |  |  |  |  | (3,154.3) | 3,154.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends to shareholders | (317,663.2) |  |  |  |  |  |  |  |  | (317,663.2) |  | (317,663.2) |  |  |  |  |  |  |  |  |  |  |  |  | (317,663.2) |  |  |
Total | (317,663.2) |  |  |  |  |  |  |  | (3,154.3) | (314,508.9) |  | (317,663.2) |  |  |  |  |  |  |  |  |  |  |  |  | (317,663.2) |  |  |
Net income | 851,027.7 |  |  |  |  |  |  |  |  | 851,740.0 |  | 851,740.0 |  |  |  |  |  |  |  |  |  |  |  |  | 851,740.0 |  | (712.3) |
Other comprehensive income (loss), net of income tax | (8,813.7) |  |  |  |  |  |  |  |  | (484.9) |  | (484.9) |  | (13,573.5) |  | 6,108.4 |  | (38.2) |  |  |  | (7,503.3) |  |  | (7,988.2) |  | (825.5) |
Total comprehensive income (loss) | 842,214.0 |  |  |  |  |  |  |  |  | 851,255.1 |  | 851,255.1 |  | (13,573.5) |  | 6,108.4 |  | (38.2) |  |  |  | (7,503.3) |  |  | 843,751.8 |  | (1,537.8) |
Disposal of investments accounted for using equity method | (18.5) |  |  |  | (18.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (18.1) |  | (0.4) |
Employee restricted shares retired | 4.6 |  | $ (4.2) |  | 4.2 |  |  |  |  | 4.6 |  | 4.6 |  |  |  |  |  |  |  |  |  |  |  |  | 4.6 |  |  |
Employee restricted shares retired, shares | shares |  |  | (0.4) | (0.4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangements | 477.7 |  | $ 21.1 |  | 564.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (108.3) |  | (108.3) |  |  | 477.7 |  |  |
Share-based payment arrangements, shares | shares |  |  | 2.1 | 2.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments in equity instruments at fair value through other comprehensive income |  |  |  |  |  |  |  |  |  | 151.9 |  | 151.9 |  |  |  | (151.9) |  |  |  |  |  | (151.9) |  |  |  |  |  |
Basis adjustment for gain (loss) on hedging instruments | (45.2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (45.2) |  |  |  | (45.2) |  |  | (45.2) |  |  |
Increase in non-controlling interests | (196.4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (196.4) |
From share of changes in equities of subsidiaries | 11,244.7 |  |  |  | (21.3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (21.3) |  | 11,266.0 |
Donation from shareholders | 16.4 |  |  |  | 16.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16.4 |  |  |
Decrease in non-controlling interests | (196.4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (196.4) |
Ending balance at Dec. 31, 2023 | 3,453,866.5 |  | $ 259,320.7 |  | 69,876.4 |  | 311,147.0 |  | $ 0.0 | 2,817,492.6 |  | 3,128,639.6 |  | (25,316.8) |  | (4,099.9) |  | 1,395.9 |  | (293.5) |  | (28,314.3) |  |  | 3,429,522.4 |  | 24,344.1 |
Ending balance, shares at Dec. 31, 2023 | shares |  |  | 25,932,000,000 | 25,932,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends to shareholders | (414,915.5) |  |  |  |  |  |  |  |  | (414,915.5) |  | (414,915.5) |  |  |  |  |  |  |  |  |  |  |  |  | (414,915.5) |  |  |
Total | (414,915.5) |  |  |  |  |  |  |  |  | (414,915.5) |  | (414,915.5) |  |  |  |  |  |  |  |  |  |  |  |  | (414,915.5) |  |  |
Net income | 1,157,523.9 | $ 35,301.1 |  |  |  |  |  |  |  | 1,158,380.2 |  | 1,158,380.2 |  |  |  |  |  |  |  |  |  |  |  |  | 1,158,380.2 |  | (856.3) |
Other comprehensive income (loss), net of income tax | 71,585.7 | 2,183.2 |  |  |  |  |  |  |  | 126.0 |  | 126.0 |  | 65,579.8 |  | 6,948.8 |  | (85.7) |  |  |  | 72,442.9 |  |  | 72,568.9 |  | (983.2) |
Total comprehensive income (loss) | 1,229,109.6 | 37,484.3 |  |  |  |  |  |  |  | 1,158,506.2 |  | 1,158,506.2 |  | 65,579.8 |  | 6,948.8 |  | (85.7) |  |  |  | 72,442.9 |  |  | 1,230,949.1 |  | (1,839.5) |
Treasury stock acquired | (3,089.2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,089.2) | (3,089.2) |  |  |
Treasury stock retired |  |  | $ (32.5) |  | (7.1) |  |  |  |  | (3,049.6) |  | (3,049.6) |  |  |  |  |  |  |  |  |  |  |  | $ 3,089.2 |  |  |  |
Treasury stock retired, shares | shares |  |  | (3.2) | (3.2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of investments accounted for using equity method | 0.0 |  |  |  | 0.0 |  |  |  |  | 3,772.8 |  | 3,772.8 |  |  |  | (4,009.1) |  |  |  |  |  | (4,009.1) |  |  | (236.3) |  | 236.3 |
Employee restricted shares retired | 19.9 |  | $ (14.0) |  | 14.0 |  |  |  |  | 19.9 |  | 19.9 |  |  |  |  |  |  |  |  |  |  |  |  | 19.9 |  |  |
Employee restricted shares retired, shares | shares |  |  | (1,400,000) | (1,400,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangements | 1,222.8 |  | $ 53.1 |  | 2,584.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,414.6) |  | (1,414.6) |  |  | 1,222.8 |  |  |
Share-based payment arrangements, shares | shares |  |  | 5,300,000 | 5,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis adjustment for gain (loss) on hedging instruments | 0.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.1 |  |  |  | 0.1 |  |  | 0.1 |  |  |
Adjustments to share of changes in equities of associates | 870.0 |  |  |  | 870.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 870.0 |  |  |
Increase in non-controlling interests | 5,349.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,349.7 |
From difference between the consideration received and the carrying amount of the subsidiaries' net assets during actual disposal | 1.0 |  |  |  | 5.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.3 |  | (4.3) |
From share of changes in equities of subsidiaries | 6,827.8 |  |  |  | (91.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (91.0) |  | 6,918.8 |
Donation from shareholders | 8.9 |  |  |  | 8.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.9 |  |  |
Decrease in non-controlling interests | 5,349.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,349.7 |
Ending balance at Dec. 31, 2024 | $ 4,279,271.6 | $ 130,505.4 | $ 259,327.3 | $ 7,908.7 | $ 73,260.8 | $ 2,234.2 | $ 311,147.0 | $ 9,489.1 |  | $ 3,561,826.4 | $ 108,625.4 | $ 3,872,973.4 | $ 118,114.5 | $ 40,263.0 | $ 1,227.9 | $ (1,160.2) | $ (35.4) | $ 1,310.3 | $ 40.0 | $ (1,708.1) | $ (52.1) | $ 38,705.0 | $ 1,180.4 |  | $ 4,244,266.5 | $ 129,437.8 | $ 35,005.1 | $ 1,067.6
Ending balance, shares at Dec. 31, 2024 | shares |  |  | 25,932,700,000 | 25,932,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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