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Income Tax - Summary of Analysis of Deferred Income Tax and Liabilities (Detail) - TWD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty $ 64,175.8 $ 69,185.9 $ 49,153.9 $ 25,958.2
Deferred Income Tax Liabilities [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty   (1,031.4) (1,873.9) (1,729.9)
Depreciation [Member] | Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty 41,094.7 45,299.3 34,720.7 19,354.4
Refund Liability [Member] | Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty 9,415.0 12,089.5 5,986.2 3,755.1
Unrealized Exchange Losses [Member] | Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty 7,100.0 5,782.4    
Unrealized Loss On Inventories [Member] | Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty 2,771.2 2,305.3 899.0 858.5
Net Defined Benefit Liability [Member] | Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty 1,729.7 1,722.0 1,237.1 1,342.1
Deferred Compensation Cost [Member] | Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty 489.6 361.2 374.0 330.3
Investment Tax Credits [Member] | Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty 19.1 945.0 5,621.7  
Others [member] | Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty 1,556.5 681.2 315.2 317.8
Others [member] | Deferred Income Tax Liabilities [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty $ (53.8) $ (1,031.4) $ (1,167.6) $ (863.4)