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Equity - Changes in Other Reserves (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Balance, beginning of year | $ (54,679.8) |  | $ (27,568.3) | $ (15,449.9)
Exchange differences arising on translation of foreign operations | (6,181.7) |  | (29,846.8) | (14,693.5)
Equity instruments | 1,898.2 |  | 423.2 | 334.5
Debt instruments | (3,339.9) |  | 3,907.0 | 3,097.3
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal | (187.7) |  | 108.7 | (162.1)
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal | (93.2) |  | (1,439.4) | (537.8)
Loss allowance adjustments from debt instruments | 1.3 |  | (0.9) | 6.9
Gain (loss) arising on changes in the fair value of hedging instruments | 90.2 |  | 24.1 | (109.6)
Transferred to initial carrying amount of hedged items | 48.5 |  | (20.3) | 82.3
Share of other comprehensive income (loss) of associates | (104.7) |  | (267.9) | (152.0)
Share of unearned stock-based employee compensation of associates |  |  | 0.2 | 1.6
Other comprehensive loss reclassified to profit or loss upon disposal of subsidiary |  |  |  | 4.6
Income tax effect | (59.6) |  | 0.6 | 9.4
Balance, end of year | (62,608.4) | $ (2,257.0) | (54,679.8) | (27,568.3)
Others - Foreign Currency Translation Reserve [member] |  |  |  |
Balance, beginning of year | (57,001.6) |  | (26,871.4) | (12,042.4)
Exchange differences arising on translation of foreign operations | (6,181.7) |  | (29,846.8) | (14,693.5)
Share of other comprehensive income (loss) of associates | (120.0) |  | (283.4) | (140.1)
Other comprehensive loss reclassified to profit or loss upon disposal of subsidiary |  |  |  | 4.6
Balance, end of year | (63,303.3) |  | (57,001.6) | (26,871.4)
Others - Stock-Based Employee Compensation [member] |  |  |  |
Balance, beginning of year | 0.0 |  | (0.2) | (1.8)
Share of unearned stock-based employee compensation of associates |  |  | 0.2 | 1.6
Income tax effect |  |  |  |
Balance, end of year |  |  | 0.0 | (0.2)
Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member] |  |  |  |
Balance, beginning of year | 2,321.8 |  | (692.9) | (3,429.3)
Equity instruments | 1,898.2 |  | 423.2 | 334.5
Debt instruments | (3,339.9) |  | 3,907.0 | 3,097.3
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal | (187.7) |  | 108.7 | (162.1)
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal | (93.2) |  | (1,439.4) | (537.8)
Loss allowance adjustments from debt instruments | 1.3 |  | (0.9) | 6.9
Share of other comprehensive income (loss) of associates | 30.0 |  | 15.5 | (11.8)
Income tax effect | (56.2) |  | 0.6 | 9.4
Balance, end of year | 574.3 |  | 2,321.8 | (692.9)
Other - Gain (loss) on hedging instruments [member] |  |  |  |
Balance, beginning of year | 0.0 |  | (3.8) | 23.6
Gain (loss) arising on changes in the fair value of hedging instruments | 90.2 |  | 24.1 | (109.6)
Transferred to initial carrying amount of hedged items | 48.5 |  | (20.3) | 82.3
Share of other comprehensive income (loss) of associates | (14.7) |  | 0.0 | (0.1)
Income tax effect | (3.4) |  |  |
Balance, end of year | $ 120.6 |  | $ 0.0 | $ (3.8)

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