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Financial Instruments - Information About the Maturity Analysis for Lease Liabilities (Detail) - TWD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities $ 11,213 $ 10,849
Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities 3,519 3,390
1-3 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities 4,819 4,446
3-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities 2,357 2,143
More Than 5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities $ 518 $ 870