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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred income tax assets (liabilities)      
Recognized in Profit or loss $ (2,654.9)    
Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 64,175.8 $ 69,185.9 $ 49,153.9
Recognized in Profit or loss 1,747.4 (5,112.8) 19,198.5
Recognized in Other Comprehensive Income (38.9) 124.6 734.0
Effect of Exchange Rate Changes 59.0 (21.9) 99.5
Balance, End of Year 65,943.3 64,175.8 69,185.9
Deferred Income Tax Liabilities [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year (53.8) (1,031.4) (1,873.9)
Recognized in Profit or loss (3,933.8)   839.3
Recognized in Other Comprehensive Income     6.0
Effect of Exchange Rate Changes (0.9)   (2.8)
Balance, End of Year (3,988.5) (53.8) (1,031.4)
Depreciation [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 41,094.7 45,299.3 34,720.7
Recognized in Profit or loss (7,787.6) (4,197.2) 10,552.2
Effect of Exchange Rate Changes 12.7 (7.4) 26.4
Balance, End of Year 33,319.8 41,094.7 45,299.3
Refund liability [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 9,415.0 12,089.5 5,986.2
Recognized in Profit or loss 3,856.8 (2,673.5) 6,100.8
Effect of Exchange Rate Changes 2.6 (1.0) 2.5
Balance, End of Year 13,274.4 9,415.0 12,089.5
Unrealized Exchange Losses [Member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 7,100.0 5,782.4  
Recognized in Profit or loss 1,978.2 1,317.6 5,782.4
Balance, End of Year 9,078.2 7,100.0 5,782.4
Unrealized loss on inventories [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 2,771.2 2,305.3 899.0
Recognized in Profit or loss (25.9) 466.2 1,402.2
Effect of Exchange Rate Changes 4.0 (0.3) 4.1
Balance, End of Year 2,749.3 2,771.2 2,305.3
Net defined benefit liability [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 1,729.7 1,722.0 1,237.1
Recognized in Profit or loss (284.8) (116.9) (249.1)
Recognized in Other Comprehensive Income (28.9) 124.6 734.0
Balance, End of Year 1,416.0 1,729.7 1,722.0
Deferred compensation cost [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 489.6 361.2 374.0
Recognized in Profit or loss 66.0 129.9 (48.2)
Effect of Exchange Rate Changes 33.2 (1.5) 35.4
Balance, End of Year 588.8 489.6 361.2
Others [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 1,575.6 1,626.2 5,936.9
Recognized in Profit or loss 1,289.8 (38.9) (4,341.8)
Recognized in Other Comprehensive Income (10.0) 0.0 0.0
Effect of Exchange Rate Changes 47.0 (11.7) 31.1
Balance, End of Year 2,902.4 1,575.6 1,626.2
Others [member] | Deferred Income Tax Liabilities [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year (53.8) (1,031.4) (1,167.6)
Recognized in Profit or loss (8.5) 976.8 133.0
Recognized in Other Comprehensive Income   0.0 6.0
Effect of Exchange Rate Changes (0.9) 0.8 (2.8)
Balance, End of Year (63.2) (53.8) (1,031.4)
Unrealized exchange gains [member] | Deferred Income Tax Liabilities [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year   $ 0.0 (706.3)
Recognized in Profit or loss     706.3
Balance, End of Year     $ 0.0
Operating Loss Carryforward [Member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Recognized in Profit or loss 2,654.9    
Effect of Exchange Rate Changes (40.5)    
Balance, End of Year 2,614.4    
Subsidiarys projected earnings distribution [Member] | Deferred Income Tax Liabilities [Member]      
Deferred income tax assets (liabilities)      
Recognized in Profit or loss (3,925.3)    
Balance, End of Year $ (3,925.3)