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Income Tax - Summary of Analysis of Deferred Income Tax and Liabilities (Detail) - TWD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty $ 65,943.3 $ 64,175.8 $ 69,185.9 $ 49,153.9
Deferred Income Tax Liabilities [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty (3,988.5) (53.8) (1,031.4) (1,873.9)
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 33,319.8 41,094.7 45,299.3 34,720.7
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 13,274.4 9,415.0 12,089.5 5,986.2
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 9,078.2 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 2,749.3 2,771.2 2,305.3 899.0
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 1,416.0 1,729.7 1,722.0 1,237.1
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 588.8 489.6 361.2 374.0
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 2,902.4 1,575.6 1,626.2 5,936.9
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 (63.2) $ (53.8) $ (1,031.4) $ (1,167.6)
Operating Loss Carryforward [Member] | Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty 2,614.4      
Subsidiarys projected earnings distribution [Member] | Deferred Income Tax Liabilities [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty $ (3,925.3)