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Income Tax - Summary of Analysis of Deferred Income Tax and Liabilities (Detail) - TWD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty $ 49,153.9 $ 25,958.2 $ 17,928.4 $ 16,806.4
Deferred Income Tax Liabilities [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty (1,873.9) (1,729.9) (344.4) (233.3)
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 34,720.7 19,354.4 13,547.2 11,839.2
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 5,986.2 3,755.1 2,150.4 2,594.0
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 5,621.7      
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 1,237.1 1,342.1 1,016.3 1,084.9
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 899.0 858.5 469.4 751.0
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 374.0 330.3 323.1 271.7
Investments In Equity Instruments At FVTOCI [Member] | Deferred Income Tax Assets [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred Tax Asset and Liabilty 10.1 66.3 65.7 56.2
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 305.1 251.5 356.3 209.4
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 (1,167.6) (863.4) (10.8) (171.6)
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 $ (706.3) $ (866.5) $ (333.6) $ (61.7)