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Equity - Changes in Other Reserves (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Balance, beginning of year $ (62,608.4)   $ (54,679.8) $ (27,568.3)
Exchange differences arising on translation of foreign operations 51,009.7   (6,181.7) (29,846.8)
Equity instruments (263.3)   1,898.2 423.2
Debt instruments (10,513.7)   (3,339.9) 3,907.0
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal (303.3)   (187.7) 108.7
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal 410.1   (93.2) (1,439.4)
Loss allowance adjustments from debt instruments 0.9   1.3 (0.9)
Gain (loss) arising on changes in the fair value of hedging instruments 1,329.2   90.2 24.1
Transferred to initial carrying amount of hedged items (52.9)   48.5 (20.3)
Issuance of shares (451.9)      
Share-based payment expenses recognized 266.7      
Share of other comprehensive income (loss) of associates 665.3   (104.7) (267.9)
Share of unearned stock-based employee compensation of associates       0.2
Income tax effect 6.0   (59.6) 0.6
Balance, end of year (20,505.6) $ (667.2) (62,608.4) (54,679.8)
Others - Foreign Currency Translation Reserve [member]        
Balance, beginning of year (63,303.3)   (57,001.6) (26,871.4)
Exchange differences arising on translation of foreign operations 51,009.7   (6,181.7) (29,846.8)
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 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 550.3   (120.0) (283.4)
Share of unearned stock-based employee compensation of associates       0.0
Income tax effect 0.0   0.0 0.0
Balance, end of year (11,743.3)   (63,303.3) (57,001.6)
Others - Stock-Based Employee Compensation [member]        
Balance, beginning of year 0.0   0.0 (0.2)
Exchange differences arising on translation of foreign operations 0.0   0.0 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 0.0   0.0 0.0
Transferred to initial carrying amount of hedged items 0.0   0.0 0.0
Issuance of shares (451.9)      
Share-based payment expenses recognized 266.7      
Share of other comprehensive income (loss) of associates 0.0   0.0 0.0
Share of unearned stock-based employee compensation of associates       0.2
Income tax effect   0.0
Balance, end of year (185.2)   0.0 0.0
Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member]        
Balance, beginning of year 574.3   2,321.8 (692.9)
Exchange differences arising on translation of foreign operations 0.0   0.0 0.0
Equity instruments (263.3)   1,898.2 423.2
Debt instruments (10,513.7)   (3,339.9) 3,907.0
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal (303.3)   (187.7) 108.7
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal 410.1   (93.2) (1,439.4)
Loss allowance adjustments from debt instruments 0.9   1.3 (0.9)
Gain (loss) arising on changes in the fair value of hedging instruments 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 38.6   30.0 15.5
Share of unearned stock-based employee compensation of associates       0.0
Income tax effect 0.0   (56.2) 0.6
Balance, end of year (10,056.4)   574.3 2,321.8
Other - Gain (loss) on hedging instruments [member]        
Balance, beginning of year 120.6   0.0 (3.8)
Exchange differences arising on translation of foreign operations 0.0   0.0 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 1,329.2   90.2 24.1
Transferred to initial carrying amount of hedged items (52.9)   48.5 (20.3)
Share of other comprehensive income (loss) of associates 76.4   (14.7) 0.0
Share of unearned stock-based employee compensation of associates       0.0
Income tax effect 6.0   (3.4) 0.0
Balance, end of year $ 1,479.3   $ 120.6 $ 0.0