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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year $ 49,153.9 $ 25,958.2 $ 17,928.4
Recognized in Profit or loss 19,198.5 23,292.3 7,660.7
Recognized in Other Comprehensive Income 734.0 (85.3) 422.7
Effect of Exchange Rate Changes 99.5 (11.3) (53.6)
Balance, End of Year 69,185.9 49,153.9 25,958.2
Deferred Income Tax Liabilities [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year (1,873.9) (1,729.9) (344.4)
Recognized in Profit or loss 839.3 (140.6) (1,385.5)
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) (1,729.9)
Depreciation [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 34,720.7 19,354.4 13,547.2
Recognized in Profit or loss 10,552.2 15,365.7 5,824.0
Effect of Exchange Rate Changes 26.4 0.6 (16.8)
Balance, End of Year 45,299.3 34,720.7 19,354.4
Refund liability [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 5,986.2 3,755.1 2,150.4
Recognized in Profit or loss 6,100.8 2,231.5 1,606.1
Effect of Exchange Rate Changes 2.5 (0.4) (1.4)
Balance, End of Year 12,089.5 5,986.2 3,755.1
Unrealized Exchange Losses [Member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 0.0    
Recognized in Profit or loss 5,782.4    
Balance, End of Year 5,782.4 0.0  
Unrealized loss on inventories [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 899.0 858.5 469.4
Recognized in Profit or loss 1,402.2 41.0 391.1
Effect of Exchange Rate Changes 4.1 (0.5) (2.0)
Balance, End of Year 2,305.3 899.0 858.5
Net defined benefit liability [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 1,237.1 1,342.1 1,016.3
Recognized in Profit or loss (249.1) (75.9) (96.3)
Recognized in Other Comprehensive Income 734.0 (29.1) 422.1
Balance, End of Year 1,722.0 1,237.1 1,342.1
Investment Tax Credits [Member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 5,621.7    
Recognized in Profit or loss (4,676.7) 5,621.7  
Balance, End of Year 945.0 5,621.7  
Deferred compensation cost [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 374.0 330.3 323.1
Recognized in Profit or loss (48.2) 49.2 27.4
Effect of Exchange Rate Changes 35.4 (5.5) (20.2)
Balance, End of Year 361.2 374.0 330.3
Others [member] | Deferred Income Tax Assets [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year 315.2 317.8 422.0
Recognized in Profit or loss 334.9 59.1 (91.6)
Recognized in Other Comprehensive Income   (56.2) 0.6
Effect of Exchange Rate Changes 31.1 (5.5) (13.2)
Balance, End of Year 681.2 315.2 317.8
Others [member] | Deferred Income Tax Liabilities [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year (1,167.6) (863.4) (10.8)
Recognized in Profit or loss 133.0 (300.8) (852.6)
Recognized in Other Comprehensive Income 6.0 (3.4)  
Effect of Exchange Rate Changes (2.8)    
Balance, End of Year (1,031.4) (1,167.6) (863.4)
Unrealized exchange gains [member] | Deferred Income Tax Liabilities [Member]      
Deferred income tax assets (liabilities)      
Balance, Beginning of Year (706.3) (866.5) (333.6)
Recognized in Profit or loss 706.3 160.2 (532.9)
Balance, End of Year $ 0.0 $ (706.3) $ (866.5)