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Income Tax - Items for Which No Deferred Income Tax Assets Have Been Recognized (Detail) - TWD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Loss carryforwards $ 47 $ 29
Deductible temporary differences 10 13
2023 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Loss carryforwards 0 0
2024 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Loss carryforwards 1 1
2025 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Loss carryforwards 15 15
Investment credits - research and development expenditures 8 0
2026 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Loss carryforwards 8 8
2027 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Loss carryforwards 3 3
2028 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Loss carryforwards 1 1
2029 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Loss carryforwards 1 1
2030 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Loss carryforwards 0 0
2031 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Loss carryforwards 0 0
2032 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Loss carryforwards 5 0
2033 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Loss carryforwards $ 13 $ 0