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Equity - Changes in Other Reserves (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Balance, beginning of year $ (27,568.3)   $ (15,449.9) $ (27,228.7)
Exchange differences arising on translation of foreign operations (29,846.8)   (14,693.5) 14,562.0
Equity instruments 423.2   334.5 (3,311.6)
Debt instruments 3,907.0   3,097.3 (1,858.0)
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal 108.7   (162.1) 1,193.1
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal (1,439.4)   (537.8) 989.1
Loss allowance adjustments from debt instruments (0.9)   6.9 (2.0)
Gain (loss) arising on changes in the fair value of hedging instruments 24.1   (109.6) 41.0
Transferred to initial carrying amount of hedged items (20.3)   82.3 (22.2)
Share of other comprehensive income (loss) of associates (267.9)   (152.0) 86.5
Share of unearned stock-based employee compensation of associates 0.2   1.6 8.5
Other comprehensive loss reclassified to profit or loss upon disposal of associates     4.6  
Income tax effect 0.6   9.4 92.4
Balance, end of year (54,679.8) $ (1,947.3) (27,568.3) (15,449.9)
Others - Foreign Currency Translation Reserve [member]        
Balance, beginning of year (26,871.4)   (12,042.4) (26,697.7)
Exchange differences arising on translation of foreign operations (29,846.8)   (14,693.5) 14,562.0
Share of other comprehensive income (loss) of associates (283.4)   (140.1) 93.3
Other comprehensive loss reclassified to profit or loss upon disposal of associates     4.6  
Balance, end of year (57,001.6)   (26,871.4) (12,042.4)
Others - Stock-Based Employee Compensation [member]        
Balance, beginning of year (0.2)   (1.8) (10.3)
Share of unearned stock-based employee compensation of associates 0.2   1.6 8.5
Income tax effect      
Balance, end of year     (0.2) (1.8)
Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member]        
Balance, beginning of year (692.9)   (3,429.3) (524.9)
Equity instruments 423.2   334.5 (3,311.6)
Debt instruments 3,907.0   3,097.3 (1,858.0)
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal 108.7   (162.1) 1,193.1
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal (1,439.4)   (537.8) 989.1
Loss allowance adjustments from debt instruments (0.9)   6.9 (2.0)
Share of other comprehensive income (loss) of associates 15.5   (11.8) (6.8)
Income tax effect 0.6   9.4 91.8
Balance, end of year 2,321.8   (692.9) (3,429.3)
Other - Gain (loss) on hedging instruments [member]        
Balance, beginning of year (3.8)   23.6 4.2
Gain (loss) arising on changes in the fair value of hedging instruments 24.1   (109.6) 41.0
Transferred to initial carrying amount of hedged items $ (20.3)   82.3 (22.2)
Share of other comprehensive income (loss) of associates     (0.1)  
Income tax effect       0.6
Balance, end of year     $ (3.8) $ 23.6