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Income Tax - Analysis of Deferred Income Tax Assets and Liabilities in Consolidated Statements of Financial Position (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year $ 69,185.9 $ 49,153.9 $ 25,958.2
Recognized in Profit or loss (5,112.8) 19,198.5 23,292.3
Recognized in Other Comprehensive Income 124.6 734.0 (85.3)
Effect of Exchange Rate Changes (21.9) 99.5 (11.3)
Balance, End of Year 64,175.8 69,185.9 49,153.9
Deferred Income Tax Liabilities [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year (1,031.4) (1,873.9) (1,729.9)
Recognized in Profit or loss   839.3 (140.6)
Recognized in Other Comprehensive Income   6.0 (3.4)
Effect of Exchange Rate Changes   (2.8)  
Balance, End of Year   (1,031.4) (1,873.9)
Depreciation [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 45,299.3 34,720.7 19,354.4
Recognized in Profit or loss (4,197.2) 10,552.2 15,365.7
Effect of Exchange Rate Changes (7.4) 26.4 0.6
Balance, End of Year 41,094.7 45,299.3 34,720.7
Refund liability [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 12,089.5 5,986.2 3,755.1
Recognized in Profit or loss (2,673.5) 6,100.8 2,231.5
Effect of Exchange Rate Changes (1.0) 2.5 (0.4)
Balance, End of Year 9,415.0 12,089.5 5,986.2
Unrealized Exchange Losses [Member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 5,782.4    
Recognized in Profit or loss 1,317.6 5,782.4  
Balance, End of Year 7,100.0 5,782.4  
Investment Tax Credits [Member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 945.0 5,621.7  
Recognized in Profit or loss (925.9) (4,676.7) 5,621.7
Balance, End of Year 19.1 945.0 5,621.7
Net defined benefit liability [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 1,722.0 1,237.1 1,342.1
Recognized in Profit or loss (116.9) (249.1) (75.9)
Recognized in Other Comprehensive Income 124.6 734.0 (29.1)
Balance, End of Year 1,729.7 1,722.0 1,237.1
Unrealized loss on inventories [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 2,305.3 899.0 858.5
Recognized in Profit or loss 466.2 1,402.2 41.0
Effect of Exchange Rate Changes (0.3) 4.1 (0.5)
Balance, End of Year 2,771.2 2,305.3 899.0
Deferred compensation cost [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 361.2 374.0 330.3
Recognized in Profit or loss 129.9 (48.2) 49.2
Effect of Exchange Rate Changes (1.5) 35.4 (5.5)
Balance, End of Year 489.6 361.2 374.0
Others [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 681.2 315.2 317.8
Recognized in Profit or loss 887.0 334.9 59.1
Recognized in Other Comprehensive Income   0.0 (56.2)
Effect of Exchange Rate Changes (11.7) 31.1 (5.5)
Balance, End of Year 1,556.5 681.2 315.2
Others [member] | Deferred Income Tax Liabilities [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year (1,031.4) (1,167.6) (863.4)
Recognized in Profit or loss 976.8 133.0 (300.8)
Recognized in Other Comprehensive Income 0.0 6.0 (3.4)
Effect of Exchange Rate Changes 0.8 (2.8)  
Balance, End of Year (53.8) (1,031.4) (1,167.6)
Unrealized exchange gains [member] | Deferred Income Tax Liabilities [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year $ 0.0 (706.3) (866.5)
Recognized in Profit or loss   706.3 160.2
Balance, End of Year   $ 0.0 $ (706.3)