XML 195 R181.htm IDEA: XBRL DOCUMENT v3.24.1.u1
Income Tax - Information About Unused Investment Credits and Loss Carryforwards (Detail)
$ in Millions, $ in Millions
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining creditable amount $ 2,099 $ 69 $ 2,197
2026 [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining Creditable Amount 8   $ 0
Unused tax credits [Member] | 2025 [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining Creditable Amount 8    
Unused tax losses [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining creditable amount 116    
Unused tax losses [Member] | 2024 [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining creditable amount 1    
Unused tax losses [Member] | 2025 [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining creditable amount 18    
Unused tax losses [Member] | 2026 [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining creditable amount 10    
Unused tax losses [Member] | 2027 [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining creditable amount 3    
Unused tax losses [Member] | 2028 [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining creditable amount 1    
Unused tax losses [Member] | 2029 [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining creditable amount 2    
Unused tax losses [Member] | 2030 [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining creditable amount 1    
Unused tax losses [Member] | 2031 [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining creditable amount 1    
Unused tax losses [Member] | 2032 [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining creditable amount 63    
Unused tax losses [Member] | 2033 [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Remaining creditable amount $ 16