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Financial Instruments - Information About the Maturity Analysis for Lease Liabilities (Detail) - TWD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities $ 11,148 $ 11,213
Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities 3,586 3,519
1-3 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities 5,255 4,819
3-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities 2,143 2,357
More Than 5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities $ 164 $ 518