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Equity - Changes in Other Reserves (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Balance, beginning of year | $ (20,505.6) |  | $ (62,608.4) | $ (54,679.8)
Exchange differences arising on translation of foreign operations | (14,255.6) |  | 51,009.7 | (6,181.7)
Gain (Loss) on hedging instruments designated as hedges of net investments in foreign operations | 618.2 |  |  |
Equity instruments | 1,953.0 |  | (263.3) | 1,898.2
Debt instruments | 3,639.8 |  | (10,513.7) | (3,339.9)
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal | (151.9) |  | (303.3) | (187.7)
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal | 473.9 |  | 410.1 | (93.2)
Loss allowance adjustments from debt instruments | 9.5 |  | 0.9 | 1.3
Gain (loss) arising on changes in the fair value of hedging instruments and hedged item affects profit or loss | (34.8) |  | 1,329.2 | 90.2
Transferred to initial carrying amount of hedged items | (45.2) |  | (52.9) | 48.5
Issuance of shares | (586.0) |  | (451.9) |
Share-based payment expenses recognized | 477.7 |  | 266.7 |
Share of other comprehensive income (loss) of associates | 92.7 |  | 665.3 | (104.7)
Income tax effect |  |  | 6.0 | (59.6)
Balance, end of year | (28,314.3) | $ (924.7) | (20,505.6) | (62,608.4)
Others - Foreign Currency Translation Reserve [member] |  |  |  |
Balance, beginning of year | (11,743.3) |  | (63,303.3) | (57,001.6)
Exchange differences arising on translation of foreign operations | (14,255.6) |  | 51,009.7 | (6,181.7)
Gain (Loss) on hedging instruments designated as hedges of net investments in foreign operations | 618.2 |  |  |
Equity instruments | 0.0 |  | 0.0 | 0.0
Debt instruments | 0.0 |  | 0.0 | 0.0
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal | 0.0 |  | 0.0 | 0.0
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal | 0.0 |  | 0.0 | 0.0
Loss allowance adjustments from debt instruments | 0.0 |  | 0.0 | 0.0
Gain (loss) arising on changes in the fair value of hedging instruments and hedged item affects profit or loss | 0.0 |  | 0.0 | 0.0
Transferred to initial carrying amount of hedged items | 0.0 |  | 0.0 | 0.0
Share of other comprehensive income (loss) of associates | 63.9 |  | 550.3 | (120.0)
Income tax effect |  |  | 0.0 | 0.0
Balance, end of year | (25,316.8) |  | (11,743.3) | (63,303.3)
Others - Stock-Based Employee Compensation [member] |  |  |  |
Balance, beginning of year | (185.2) |  | 0.0 | 0.0
Exchange differences arising on translation of foreign operations | 0.0 |  | 0.0 | 0.0
Gain (Loss) on hedging instruments designated as hedges of net investments in foreign operations | 0.0 |  |  |
Equity instruments | 0.0 |  | 0.0 | 0.0
Debt instruments | 0.0 |  | 0.0 | 0.0
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal | 0.0 |  | 0.0 | 0.0
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal | 0.0 |  | 0.0 | 0.0
Loss allowance adjustments from debt instruments | 0.0 |  | 0.0 | 0.0
Gain (loss) arising on changes in the fair value of hedging instruments and hedged item affects profit or loss | 0.0 |  | 0.0 | 0.0
Transferred to initial carrying amount of hedged items | 0.0 |  | 0.0 | 0.0
Issuance of shares | (586.0) |  | (451.9) |
Share-based payment expenses recognized | 477.7 |  | 266.7 |
Share of other comprehensive income (loss) of associates | 0.0 |  | 0.0 | 0.0
Income tax effect |  |  |  | 0.0
Balance, end of year | (293.5) |  | (185.2) | 0.0
Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member] |  |  |  |
Balance, beginning of year | (10,056.4) |  | 574.3 | 2,321.8
Exchange differences arising on translation of foreign operations | 0.0 |  | 0.0 | 0.0
Gain (Loss) on hedging instruments designated as hedges of net investments in foreign operations | 0.0 |  |  |
Equity instruments | 1,953.0 |  | (263.3) | 1,898.2
Debt instruments | 3,639.8 |  | (10,513.7) | (3,339.9)
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal | (151.9) |  | (303.3) | (187.7)
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal | 473.9 |  | 410.1 | (93.2)
Loss allowance adjustments from debt instruments | 9.5 |  | 0.9 | 1.3
Gain (loss) arising on changes in the fair value of hedging instruments and hedged item affects profit or loss | 0.0 |  | 0.0 | 0.0
Transferred to initial carrying amount of hedged items | 0.0 |  | 0.0 | 0.0
Share of other comprehensive income (loss) of associates | 32.2 |  | 38.6 | 30.0
Income tax effect |  |  | 0.0 | (56.2)
Balance, end of year | (4,099.9) |  | (10,056.4) | 574.3
Other - Gain (loss) on hedging instruments [member] |  |  |  |
Balance, beginning of year | 1,479.3 |  | 120.6 | 0.0
Exchange differences arising on translation of foreign operations | 0.0 |  | 0.0 | 0.0
Gain (Loss) on hedging instruments designated as hedges of net investments in foreign operations | 0.0 |  |  |
Equity instruments | 0.0 |  | 0.0 | 0.0
Debt instruments | 0.0 |  | 0.0 | 0.0
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal | 0.0 |  | 0.0 | 0.0
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal | 0.0 |  | 0.0 | 0.0
Loss allowance adjustments from debt instruments | 0.0 |  | 0.0 | 0.0
Gain (loss) arising on changes in the fair value of hedging instruments and hedged item affects profit or loss | (34.8) |  | 1,329.2 | 90.2
Transferred to initial carrying amount of hedged items | (45.2) |  | (52.9) | 48.5
Share of other comprehensive income (loss) of associates | (3.4) |  | 76.4 | (14.7)
Income tax effect |  |  | 6.0 | (3.4)
Balance, end of year | $ 1,395.9 |  | $ 1,479.3 | $ 120.6

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