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Income Tax - Summary of Analysis of Deferred Income Tax and Liabilities (Detail) - TWD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty $ 69,185.9 $ 49,153.9 $ 25,958.2 $ 17,928.4
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) (344.4)
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 45,299.3 34,720.7 19,354.4 13,547.2
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 12,089.5 5,986.2 3,755.1 2,150.4
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 5,782.4 0.0    
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 2,305.3 899.0 858.5 469.4
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 1,722.0 1,237.1 1,342.1 1,016.3
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 945.0 5,621.7    
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 361.2 374.0 330.3 323.1
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 681.2 315.2 317.8 422.0
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 (1,031.4) (1,167.6) (863.4) (10.8)
Unrealized Exchange Gains [Member] | Deferred Income Tax Liabilities [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty $ 0.0 $ (706.3) $ (866.5) $ (333.6)