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Equity - Changes in Other Reserves (Detail)
$ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2021
TWD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
TWD ($)
Balance, beginning of year $ (54,679.8)   $ (27,568.3)
Exchange differences arising on translation of foreign operations (3,095.3)   (11,690.1)
Equity instruments 817.4   (22.4)
Debt instruments (1,622.5)   3,625.5
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal 278.8    
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal (169.3)   (926.9)
Loss allowance adjustments from debt instruments 1.6   (0.2)
Gain (loss) arising on changes in the fair value of hedging instruments (41.4)   (42.8)
Transferred to initial carrying amount of hedged items 41.4   46.6
Share of other comprehensive income (loss) of associates (69.1)   (179.8)
Share of unearned stock-based employee compensation of associates     0.2
Income tax effect (55.8)   0.4
Balance, end of year (58,594.0) $ (2,099.4) (36,757.8)
Others - Foreign Currency Translation Reserve [member]      
Balance, beginning of year (57,001.6)   (26,871.4)
Exchange differences arising on translation of foreign operations (3,095.3)   (11,690.1)
Share of other comprehensive income (loss) of associates (73.6)   (176.3)
Balance, end of year (60,170.5)   (38,737.8)
Others - Stock-Based Employee Compensation [member]      
Balance, beginning of year     (0.2)
Share of unearned stock-based employee compensation of associates     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)
Equity instruments 817.4   (22.4)
Debt instruments (1,622.5)   3,625.5
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal 278.8    
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal (169.3)   (926.9)
Loss allowance adjustments from debt instruments 1.6   (0.2)
Share of other comprehensive income (loss) of associates 4.5   (3.5)
Income tax effect (55.8)   0.4
Balance, end of year 1,576.5   1,980.0
Other - Gain (loss) on hedging instruments [member]      
Balance, beginning of year     (3.8)
Gain (loss) arising on changes in the fair value of hedging instruments (41.4)   (42.8)
Transferred to initial carrying amount of hedged items $ 41.4   $ 46.6