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Equity - Changes in Other Reserves (Detail)
$ in Millions, $ in Millions
 12 Months Ended
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)