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Financial Instruments - Information About the Maturity Analysis for Lease Liabilities (Detail) - TWD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities $ 10,406 $ 9,737
Less Than 1 Month [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities 3,228 3,397
1-3 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities 4,126 4,240
3-5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities 1,808 1,691
More Than 5 Years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Lease liabilities $ 1,244 $ 409